Not me as an individual, but various communities I'm in contact with have stickers ingrained into their culture and social norms. People collect up to hundreds of stickers for different situations, make their own based on shared iconography, and some even have custom stickers commissioned from artists, of themselves, of characters they've created, etc. For groups that are really invested in stickers, migrating to an app which lacks them would significantly alter their dynamics.

You don't understand. I live for stickers on Telegram. It's an essential part of communication for millions. This is not a joke. Especially in Asia

To succinctly convey emotions, opinions, viewpoints, "feels". To simply have a non-verbal vocabulary, to have a different quality to certain parts of the communication, to signify a different quality of seriousness/playfulness/feeling.

It's the new emoticon. :-)

I'm curious, are they used anything like memes that you can easily send more than once?

Not sure what you mean by "like memes". They are just funny images with thousands of variations that you can send. If you're going to sleep - send something cute that shows it.

Some examples http://www.line-stickers.com/

The only thing I could see that would potentially top this would be talking animated emoji....The feces one comes to mind specifically

It it talks, it takes too much time to parse, and it becomes too specific.

Pictures, maybe with a max 0.5 sec animation are okay, and no sound. (At least that's my hunch.)

So basically emojis?

Sure, if emojis could be infinitely extended with arbitrary images and were sent as their own messages instead of being embedded inline with other text. Replying to another message with a sticker also fills the role played by reactions on Facebook Messenger.

I use some of them to communicate moods, or recurring ideas that are bothersome to enunciate over text.

E.g. these:

https://stickers.acidodivertido.com/wp-content/uploads/2017/...