Originally joined Facebook purely to play chess against my boss (Markco). He regularly beat me, our aggregate was something like 26-8-2 to him. He then joined chess.com and I followed, the tournament element being the real attraction.. and the hope that I might improve enough even things up a bit.
(Which I have.. and then some ;-D LOL)
And I've been addicted since!
[Well, up until recently when I've had loads of time-outs after having our little lad Elliot.]