I really can't stand facebook
Years ago I signed on to it, realised it was an utter utter waste of time, and deleted the account.
Then the other day someone wanted me to communicate via whatsapp, so I installed it. The *very first thing it did* was to slurp all my contacts, send them back to its servers, present me with a list of them who were also users, and presumably also sent the whole lot to facebook (who I'd forgotten had bought whatsapp).
Bastards. Too late, I deleted it.