[lucastx]

People underestimate a lot the power of "useless" features, if well designed, to attract new users.

Telegram's Stickers are probably one of the features that most people feel other messengers lack to make people enjoy using it. Lots of friends are actually communicating daily through GIF's.

[my_ghola]

The desktop client without having to have my phone around is useful too.

[nickik]

There is a desktop client. Even if you don't use chrome/chromium, keeping it open somewhere is not impossible task.