When you are on a website you should not put all your information up there,like where you live,what school you go to,or where our location is.
Another thing is you should tell your age and don't lie.
Also like posting pictures,when you upload photo's other people can copy your pictures,or even steal your identity.
Protect your information. if it's personal than put it up there.
Also never meet someone in person that you meet over the net.