A short story: Ten years ago or so, I thought it might be interesting to get an account on this new Facebook thing. So I went to sign up. First question was my name. OK, that's reasonable. Next question was my birth date. They DON'T need to know that, and I entered a date that was somewhat off. Immediately, FB replied that I had not entered my correct birth date and that I must enter the correct date. CREEPY! That's what the "close window" button is for, and I did, and I've never been back. Fewer "friends," perhaps, but more real friends, and fewer worries, for sure.
And now I see that one can log into Agon with FB. The HORROR! Big Brother watching and remembering your every click...