The name you signed here is your real name or just the net name?

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Hi guys, Just now,I came across a discussion posted by a name which was same as one of my colleagues and then I confirmed indirectly to one of her friends that it really was her.I don't know whether it is wise to use your true name is the net because as you know, the cyber crimes happen every day especially for those, who posted their photos online. so guys, the name you used here is you really name?? what do you think about this?