Funny enough: the FB app never crashed on me, but Twitter does reproducibly crash after about 20 actions (Android).

Whatsapp however regularly loses its connection on Wifi (even when on battery, and wifi powersaving is disabled), and after 6 hours I see "oh, 20 new messages"...

Problem of scale is that neither of the three (or, actually two) companies has a public bug tracker where one could report bugs and see if anything happened with it. You basically feel like you're interacting with a fucking black box.