Never trust a guy who doesn't tip and/or doesn't tip servers well. Tipping is a sign of politeness and gratitude and if he can’t find it in himself to tip someone who keeps his eight glasses of Dr. Pepper full – lite ice – he’s never going to be grateful for the things you do. The more you know.
Never trust a guy who hands out his business card at a bar on a Friday night. Who does he think he is, the Don Juan of Wall Street?
Never trust a guy who makes a quick judgment about ANY of your friends or family members (especially if you just started dating!). Even if your brother is a prejudice asshole who wears too much cologne, that's for you to say, not him.
Never trust a guy who's Facebook profile photos have a different girl in each one. He doesn’t just "happen" to be surrounded by beautiful women all the time, it's either a rolodex of ex-girlfriends or a rolodex of girls he doesn't really know, but thinks are hot and would like to know, so he gave them a dollar for a photo. And then they walked away.
Never trust a guy who uses a MySpace, still.
Never trust a guy who changed his screen name on a social network that dubs him king of something. IE: BeerPongPrince, TheWomanMaster or BestontheWest – I'm going to stop now because I'm making myself sick.
Never trust a guy who wears Hawaiian shirts unless he's Tommy Bahama or your Dad. Do I really need to give you a reason?
Never trust a guy who "likes" photos of girls in pasties on their spring break on Facebook. You don’t want to be with someone who does things like that. Everyone can see that activity and that’s just embarrassing, come on now.
Never trust a guy who initiates contact with you by poking on Facebook. Unless all you want is a relationship full of poking, theoretically and physically, then I guess you can trust him.
Never trust a guy who has all his information hidden on Facebook and don't give me that "but he's just private" bull. How strange is it that you can't see his friends, his comments, his photos, his information, his everything? What's he doing on there? Who’s he poking? What's he hiding?