For my blog, I use only first name on there.
For SDN, I purposefully use incorrect information identifying myself. Nothing huge, I've fudged my age, home campus, and city location on here from the very beginning. I think my current persona here has me at age 23 or 24 living in irvine, ca (orange county) and graduated uci in 2005.
Facebook is a closed system, so the only way an adcom can see my profile is if they ask one of my 678 listed friends to log-in. I have friends that sit on adcom interview panels and they all kinda like me, so that's set 😀 Besides, half of them I've been drunk around. But I still sterilize it now and again (ex. if there's a photo of me dry heaving into the toilet, i'll delink it).
yes....you can say i'm a little paranoid, but as an undergrad doing interviews for things like clubs/student government, I've actually pulled up a person's facebook profile ahead of time/did a google search. I HAVE based my decisions partly on what was in them. So based on what I have done personally, I act as though the same things were being done to me.