I haven't left because I was concerned about the data they were collecting, I left because I realised that I couldn't stop going on facebook, any time my hands were free I would open up my phone and check the feed, scroll through the endless stream of garbage and crap I didn't care about in the slightest. That, and the fact that I was getting really depressed by all the news surrounding brexit, then I would go and read comments and be completely negative about everything, and facebook was just amplifying the negativity tenfold.

I just cut the cord and I am now a lot happier without it, facebook is literally a drug,