It should tell you whether they respond to messages a lot, a little, not at all, etc. Lots of the average to hot chicks get tons of messages every day, so if you message one you better say something more than "hey saw your profile and wanted to say hi."
I'd just start browsing various chick's profiles, then a few days later see if any looked at your profile (you can see it in the Visitors option in the Connections tab). Maybe message some that looked at your profile; although remember lots of chicks browse anonymously so they don't get tons of messages.