I can't send invites. That's a little ghey. I have three free games downloaded now and can't add people. I have to have them add me.
Actually one thing I just thought of.
When I click on your profile, it says I can't do anything because "this user hasn't set up a profile/set information"
Try editing your profile and settings. Like fill out description, set url for your profile page, etc. See if you can view your profile and then try.
ok, but I thought I already had.
Well, this is the screen I get when I try to visit your profile
http://steamcommunity.com/profiles/76561198070010835"No information given.
This profile is private."