For what it's worth, there was a new yorker article from around the middle of 2011 where the feature is online dating. One of the researchers they interviewed concluded that guys are basically looking for girls that laugh at their jokes, and girls are basically looking for guys to make them laugh (to the point that they joked their next dating service would be called girlsthatlaughatmyjokes.com and guysthatmakemelaugh.com)