How to find a guy on Facebook without last name?

[Rachel]

So the other night I went to a concert and me and my friend started hanging out with this group of guys that were really nice and fun. I got a few of their first names and I know which college one of them goes to. I want to find him on Facebook but I don't have a least name
Do you have any more advice to help me get in touch with him? Thanks!

[Sky..]

You can search their only their first name and match their profile picture(if they have used their real photos). This is the only way to find them with only their first name. If you knew their email id or phone number, then it would be easier to find them.