Remembering what Facebook did with XMPP (initially allowed their users to speak to other messengers' users, then got sloppy with compatibility, causing great workload to unrelated app developers, and finally, having accumulated enough mass for Messenger, stopped supporting XMPP) - Facebook should be avoided like fire.
Facebook is also bad for society, allowing manipulation (targeted advertizing), aggregating great amounts of user data (harming privacy) and prioritizing user engagement regardless of the social cost (a hateful conflict generates more clicks than cat photos).
Removed by mod