1 pic wont allow anyone to do anything to you... just remember that the internet is a horrible place for ppl insulting 1 and other and ppls looks are 1 of the main things they go for.. luckly funadvice i think is very well manned so a hell of a lot safer than the other social sites.. go for it youll be fine.. infact i think funadvice encourage their users to have at least 1 pic of themselves up so id say to go for it and not to worry :)
As long as you don't give out too much information (where you're from, put pictures up where you live, school you go to, email address, etc) then you should be fine. A picture of yourself won't give too much away. :)
I don't think one pic would hurt, just do not give out much REAL info....you can't trust ANYONE in life.
if i put a pic of me could anybody know me and do stuff to me. i been worried about that