I had never used Facebook during my earlier school years and wanted to jump on the (late) train to help socialliaze with other students at my uni.
I already hated Facebook at that time, but I seriously needed to make friends. I was planning never to upload anything of myself and only use it to check on social events and stuff like that.
I was reluctant to give them the usual personal information during registration, but those were generic info I already gave to lots of other websites so I complied.
After registration, I logged out and back in again, only to find out that there had been some kind of problem and that NOW I was required to upload a personal picture of myself so they can verify it really was me (despite me never having sent them any photo).
I knew they were trying to manipulate me with gambler's fallacy. I went this far giving them some info, surely it wouldn't hurt giving them a single personal picture?
This behavior felt so disgusting to me that I did not complete the account "recovery" process.
The funny thing is that if they had been honnest right from the start and required I uploaded a picture during the registering process, I may actually have used FB.
Reflecting back, I'm glad I did not use it. FB is a sinking ship that did more harm to society than good. And I did not need it to make friends at uni anyway.