BC SOCIAL MEDIA
Saved by @CodyyyGardner

It makes me smile every time I notice IGListKit at work in Instagram. We put a lot of work into making and improving it. Proud to see it holding up 4 years later.

🧵 with some memories on how it was built:

 At Instagram, product work slowed around the holidays, so we used the time to pay down tech debt. In winter 2014 I reviewed a +12k line refactor from UITableView to UICollectionView.

We recently dropped iOS 5 so we could use the new 6+ APIs without backwards compatibility.
That review taught me a lot about UICV: data sources should mutate in one place else risk out-of-sync exceptions, the first view layout may reloadData, sticky headers make good perf hard, and many more UICV tidbits
We used reloadData for everything and it worked, for the most part.

Except two things bugged the hell out of me:

1. No animated changes (duh)
2. Images could flicker and the like animation could cancel
I dug into the latter and learned that if you reloadData, every cell on screen gets reused. So even if nothing in the UI changes, you still reuse (or init) cells, bind data, set images, etc. that’s a lot of work!
When you liked a post, we’d call reloadData. Since all cells are replaced: we had to track the liked row, reload, and THEN perform the like animation. 😓

If something triggered another reload after the animation started, the cell cancelled the animation (thus the UI bug)
The image flickering issue was simpler:

When an image cell is reused set the background to grey, async load the image (cache or network), set the image. The async time between reuse and fetch/set from cache is where the flicker came from.
(@ryanolsonk solved the image flicker with an insanely clever “weak image cache” design. It’s a great interview question 😉 )
This all got me thinking: what if we only updated cells when the data changes? This general idea was gaining traction (ahem, React): bind data to views, and diff the data on change to only rebind changed data+views.

Enter UICV performBatchUpdates
Using the principle of only updating the data source in one place, I could diff the from/to data and use UICVs APIs to insert/delete/reload/move. Anything unchanged wouldn’t get touched!

So how the hell do I write a diffing algorithm? I literally had never done this.
I researched several algos: rsync, Myers, react...

I settled on Paul Heckel’s https://t.co/jpxuHNlpXg

Why?

1. It’s output matched UICV’s APIs: inserts, deletes, updates, and moves
2. There were example implementations I could actually understand
A pivotal decision was how we define identity and equality. I wanted to piggy-back off NSObject’s -hash and -isEqual: methods to spare our engineers having to write/understand diffing concepts.
@ryanolsonk convinced me I was wrong bc writing proper -hash is complex https://t.co/4PgDCykAna

Foundation hashes can collide
https://t.co/h9eVHO342U

Or are too basic for diffing
https://t.co/Pp0eVFRS5e https://t.co/ZNPJnXlXa4
We settled on a hybrid API: a protocol with custom identifier and -isEqual: We later scrapped the NSObject tricks as they were easy to abuse & forget, resulting in crashes.
Fun fact: the library was originally called “IGStoryKit” but my director hated that so we renamed it. Glad we did, guess what launched 6 months later? 🤪
Over the next several months, @jesse_squires and I refactored probably 20k lines so that we could run our new infra alongside the old one. This let us safely A/B test performance before rolling out.
We started with single-item feeds but quickly moved to support the main feed. Main feed was scary (we were starting to run ads 😬) but if we could replace feed, then the rest of the app would fall in line.
@ocrickard and I spent a couple months investigating crashes and tuning performance. I learned a lot about ObjC++ during this time (unordered_map was waaaay faster than NSDictionary for our diffing).
We ended up filing 4 UICV radars from all this investigation! Some have been closed

https://t.co/BACvyI2l08+
When everything was fixed, we launched. I spent a year advocating the eng org help refactor and deprecate the old infra. It came down to the profile view. I rolled up my sleeves and did it myself. It was TOUGH

With profile done, I submitted a -12k change to remove the old infra.
From the start we wanted to open source the library. It ended up being a lot of paper work and internal politics, but we did it. Forever grateful to @jesse_squires for setting the project up for success and @mikeyk for having our back.
We started writing the library in late 2015, launched feed summer of 2016, and deleted the old infra in early 2017.

Throughout this the eng team 10x’d and users 4x’d, we launched tons of products (Stories!), IG opened a NY office, UICV got diffable data sources, and more.
After we launched 4y ago I calc’d our diffing algorithm executes over 40,000 times a second. I can’t imagine what that is now!
Building IGListKit was a career’s-worth of learning packed into a couple years.

I’m proud that it’s still powering Instagram today, but I’m looking forward to learning about what replaces it.

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Immo Landwerth
Immo Landwerth
@terrajobst
Many people are stressed by social media, especially Twitter.

Here is what I do to keep my sanity:

1. Be selective who you follow. Choose uplifting people and people you enjoy talking to.

2. Mute and block liberally. “But freedom of speech”. Nonsense. You choose your friends and parties in real life. Same applies to social media. It’s not immoral to ignore people who dunk on you. This also includes the annoying “devil’s advocate” personalities.

3. Choose your online persona. I mostly use Twitter for work and for engagement with the .NET community. But I’m still a human. Don’t let others dictate what you can and cannot talk about.

4. Choose wether you use your real name or a pseudonym. Social media is about authentic and real human encounters. Your name isn’t as important has how honest you can be in your conversations. Being anonymous is totally cool if that lets you be who you are.
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Ranveer Allahbadia
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@BeerBicepsGuy
How I built a 7 Million+ strong COMMUNITY on social media, in 5 years.

(A thread)

Video content is the past, present & future.

Golden rule of social media : People gravitate towards HUMANS & their stories.

The easiest way to attach people to your journey is COMMUNICATION through video.

If you cant come on screen, at least use voice. Video>Photo>Written.


From day 1 :
- Wrote down ALL ideas on paper (content pieces, growth strategies, future targets)
- Decided to expand my team, whenever my income allowed me to.
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Don't just rely on YouTube income or brands for money. You may also provide SERVICES to fans.


But in the long term, BIG money will come from brands.

Therefore accumulate numbers and create your own niche.

How to get numbers?
- Entertain or Educate or Motivate

- Create videos/pieces that address people's most common questions/thoughts about the niche you've chosen.

As you grow through your base strategy of video creation (could be YT, IG Reels or even LinkedIn Video)...

You can further community loyalty through sharing pieces of your personal story. How?
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Be a good storyteller.
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Sall Grover
Sall Grover
@salltweets
1. I'm the CEO of a platform for females & know I have a unique insight into the single sex space debate. I see it play out in real time.

During our 1st MVP test phase, 1000s of TW onboarded & created "KILL TERF" profiles.

Are we supposed to take these seriously or not?


2. I fought to include TW on Giggle but the reality is I fought not knowing the hostility of the situation. I was shocked & devastated by the KILL TERF & other obscene profiles, but...

Is "KILL TERFS", "RAPE TERFS" & "LOOK AT MY GIRL DICK" what we can except in the real world?

3. Is it "just" something said to women online or is it something that would be done in "analogue" female spaces?

It's a really important questions to ask, because not only do women not want to read stuff like this... we don't want to physically experience it either.


4. It's important to remember, without this abhorrent behavior we'd all be having a very different debate.

This behavior has *added* to womens fear.

You can dismiss it if it doesn't suit your agenda. But if you do, no solution to ensure the safety of *everyone* will be found.

5. When I read something like this, what stands out to me is the line "a lot of the time I'll get side eye or even outright harassment." Lucky you!

Imagine getting a rape threat.

When that statement is put into the context of the admission prior to it, it's scary for women.
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David Kadavy
David Kadavy
@kadavy
An annoying feature in an "influencer" career is that it seems like you'll be much better off if you're "nice" to everyone.

You can always collaborate or "swap." You don't like their work, or maybe even them as a person, but gosh can you pass up this opportunity?

This might be an illusion. You're probably better off ignoring everyone and focusing on your own work.

Then again, it might not be an illusion. It's something I've noticed with successful Hollywood people. They're so damn nice. Either they are extremely agreeable people, or they have to fake it.

However, it's a much more people-oriented business than publishing.
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Benefits of writing SRI RAMA Jayam!!!

Writing Sri Rama Jayam is known as Likitha Japam- Writing Meditation. This gives one a complete sense of surrender to an inner conscience and peace while writing or chanting the mantras.

#Sri_Rama_Jayam #RamaNavami

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You can write this in any language of your choice. It is the connecting chords with the divine and your inner self.

Below are some points that we came across on the benefits :

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1. Vedas tell that as the sun dispels the darkness, the chanting of Rama Nama dispels all evil and obstacles of life. It is a way of liberation and salvation of human suffering.

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writing ‘Sri Ram Ram Ram’ gives you the most needed clarity of thoughts to find away out of odd situations.

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Roger Grosse
Roger Grosse
@RogerGrosse
Important paper from Google on large batch optimization. They do impressively careful experiments measuring # iterations needed to achieve target validation error at various batch sizes. The main "surprise" is the lack of surprises. [thread]

https://t.co/7QIx5CFdfJ


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Vibhu Vashisth
Vibhu Vashisth
@VIBHU_Tweet
IT WAS RISHI KANADA WHO GAVE THE ATOMIC THEORY & TALKED ABOUT THE GRAVITY OF EARTH, 2600 YEARS BEFORE AN APPLE FELL IN FRONT OF NEWTON'S EYES:

Scientists of the modern world credit an English scientist John Dalton (1766 CE -1844 CE) for the Atomic Theory.


And this is because, most of us are not even aware of an ancient Indian Sage named Kanada, who was the first to formulate the theory of atoms, almost 2600 yrs before Dalton and talk about earth's gravity.


Rishi Kanada was born around 600 BCE in Dwarka, Gujarat and he was the son of a philosopher named Ulka. He was fascinated with the minute detailing of the things right from his childhood. Once, when he was very young, he accompanied his father on a journey to Prayaga.


He saw plentiful grains scattered along the path leading to the shore of river Ganga. It's a tradition in Hindu families to scatter the grains for the ants and birds to feed on them. Suddenly, an ant caught his attention, who was feeding on a rice grain.


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प्रलय पयोधि-जले धृतवान् असि वेदम्
विहित वहित्र-चरित्रम् अखेदम्
केशव धृत-मीन-शरीर, जय जगदीश हरे!!


छलयसि विक्रमणे बलिम् अद्भुत-वामन
पद-नख-नीर-जनित-जन-पावन
केशव धृत-वामन रूप जय जगदीश हरे


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Simon Wardley #EEA
Simon Wardley #EEA
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X : Our executive team is concerned that we need to up our game in order to out innovate Amazon.
Me : Do you map?
X : Yes
Me : Like this?
X : No. What's that?
Me : A map of a tea shop.


X : Why is that a map?
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Me : They’re also good for measuring and managing capital flow, making investment decisions, removing bias and getting rid of duplication.
X : I don’t see how that helps with innovation?


Me : Well, innovation is a tricky word because we use it to describe many things. If you’re talking about differentiation with the adjacent unexplored then you’re experimenting in the “uncharted” space e.g. immortality with magic provided by the special custom built kettle.


X : That sounds like nonsense.
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X : We need more reliable innovation.
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