How can i convince my mom to let me have a facebook?

[Zee]

Well how old are you? if you are 14 or over then i think a facebook account is perfectly fine. If you are that age then 'because i said so' is not a very good thing to say, it is your mothers right to put down and enforce rules, but some should be let go when you get to certain ages.
I suggest if you are old enough, just tell her that you are mature enough to have one, and you won't be silly and add people you don't know, or put up personal information.