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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Venkatesh Rao
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social media use really calls for something closer to a driver's license than terms of service... most apparent bad behavior here is more incompetence than malice, like not knowing how to change lanes or take turns at a 4-way stop..

trump's history on twitter is something closer to a crazy car chase on LA streets than bad driving (with the cops MIA, but media helicopters in pursuit), but almost all unpleasantness around here is just poor driving skills

not that I'm advocating for a licensing regime... that would be a terrible thing. Do not need a social media DMV. But the underlying principles (as tested for eg. in the written and road tests) are pretty good.

Written test would test things like "safe following distance" (reply-guying = tailgating?)

Road test would actually expose you to routine provocations. Like, "make a left turn" = "deal with this concern troll"

As in the driving test, where an awkward, unnatural, and unintuitive bit, the parallel parking test, is the toughest bit, there would be some such awkward maneuver you'd have to learn (hmmm... what's the parallel parking equivalent on twitter?)
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Toby \u2615\ufe0f
Toby ☕️
@tobydoyhowell
1/ Creating content on Twitter can be difficult. A thread on the stack of tools I use to make my life easier

2/ Thread writing

Chirr app

Price: Free

What I like: has a nice blank space for drafting and a good auto-numbering feature

What I don't: have to copy and paste tweets into Twitter after thread is drafted and can't add pics

https://t.co/YlljnF5eNd


3/ Video editing

Kapwing

Price: Free

What I like: great at pulling vids from youtube/twitter and overlaying captions + different audio on them

What I don't: Can't edit content older than 2 days on the free plan

https://t.co/bREsREkCSJ


4/ Meme making

Imgflip

Price: Free

What I like: easiest way to caption existing meme formats, quickly

What I don't: limited fonts

https://t.co/sUj13VlPiO


5/ Inspiration

iPhone notes app

Price: Free

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What I don't: difficult to organize
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Adrian Mario
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THREAD ALT-COMM 🔄
I suggest @manyver_se as TW + FB replacement! It has no server, hence no shutdown! Everything reside on your + friends phone/or PC. You do posts as in TW/FB or private DM.
Generate an ID. Then share invite-codes with friends. See> https://t.co/2OMw7e0bUB ++>

Once you installed the app you can start post threads as "public". For the moment they will be stored on your device. Once you have contacts, they will share that. Is like offline blogging! ++>>

The huge advantage; no server can shutdown your communication! Friends share your posts, so it's resilient if not always online. Is an "off-grid" optimal solution. Is a bit tedious to share "invite-codes" but it's worth. Check>

The most obvious way to CONNECT, is to invite each friend with his special [DHL] generated code. https://t.co/ayurByEtmV Can be shared via mail, or any other means. Use a secure mail like @TutanotaTeam or @ProtonMail ++>>

If some group leader wants, he can do a pub-server where only contacts reside. You must get here an invite-code to to access that server. On digital ocean we can employ one:
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கல்யானைக்கு கரும்பருத்திய படலம்


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Abhisheka Pandyan was shocked to receive such a reply from Siddhar,& he decided to test the power of this Siddhar. By that time, Raja saw a person in crowd having Sugarcane.

Raja took Sugarcane from that person.
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Shri Krishna Leela

This is a beautiful story of Guruvayurappan. Once there lived in Guruvayur a poor family. Kitta, his wife & kids were struggling for their daily needs. With only a coconut tree in house, he earned a living by selling coconuts.


Kitta was from a low caste family. He was a great devotee of Guruvayurappan. Everyday before going to work he always prayed infront of a picture of Guruvayurappan in his house. His only wish was to worship at Guruvayur & have annadanam in temple. But he was not allowed there


It was Utsavam time in Guruvayur. From far behind kitta and family worshipped Guruvayurappan. Annadanam was given daily and no one was left empty stomach. Only Kitta didn't receive. That night, it was only Kitta's family who was sleeping without food. After temple nada closed


Shri Krishna, dressed himself as a Brahmin went to temple Kitchen. He packed food and went directly to kitta's house. Reaching Kitta's house, Shri Krishna told he was sent by a cook of Guruvayur temple and gave them the food he packed. Kitta and family was very happy seeing food.


When Kitta finished his food, Brahmin asked it will be better if he get a tender coconut( karikku)to drink. Kitta climbed the tree and gave all coconuts to him. After having 1 tender coconut, the Brahmin asked to bring remaining coconuts to Guruvayur temple the next day.
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