Because it's the best discussion platform we have on the web, like a less nerdy version of Reddit. Politicians post on it and actually interact with their follo

Because it's the best discussion platform we have on the web, like a less nerdy version of Reddit. Politicians post on it and actually interact with their followers (with proper threads and without dumb character limits). There are groups for funny cat pictures that many people follow. You can ask "hey what do you think of this thing?" and get email-length responses from people you actually know. It's like a centralised comment section for the internet. Its messenger also works on all platforms. It boggles the mind that this is still the exception. iMessage only works on Apple devices, WhatsApp only supports one device per user, Skype is run by idiots. Messenger has all users, devices and features covered. It's the new IMAP, although WhatsApp/LINE/kik etc are more popular with the mobile-only crowd.