Technology preview: Private contact discovery for Signal
In case someone from Open WhisperSystems is reading: please add stickers. Seriously, I know so many people who are on Telegram just because of its sticker system and won't consider anything without that feature. This comes up again and again in online discussions where Signal is mentioned, and it hurts to see all the care and effort the OWS team has put into providing real security rejected out of hand because of it.For the uninitiated, stickers are essentially a UI layer on top of image sending. Each user has a collection of stickers which they can add images to. This collection can be scrolled through quickly and any sticker can be sent to a chat with a tap, like a sort of custom emoji. Other users who see a sticker can add it to their own local collection by tapping on the sticker message. I see no technical reason why this couldn't be built on top of the Signal Protocol.