I never joined. I would advise anyone else not to join.
I'm right with NT on this one.
A salutory tale.
I've never been near FB. I'm far too uncool.
However, about two years ago a FB page got created electronically with my name on it from one or other .com I've purchased from in the past. Impossible to tell which one.
Then about 18 months ago a credit card fraud was attempted on my card, which the bank picked up on immediately. The banks are pretty good at this nowadays.
A bit of detective work and judicious hacking from a friendly IT department traced the source of the fraud back to this particular FB page. When it was opened and the various links tested, not only did it contain all the numbers for the particular credit card, it had my home address, both personal and private email addresses, and a whole lot more information I'd rather keep between me and any trading website I choose to deal with.
I admit I don't know how tagging works, but I am told that the right tag in the right place or on the right photograph could lead anyone straight to that page. Is that understanding correct?
In any case, FB is the first place any employer will look at when they identify potential job candidates.