I don't hang out with strangers. If a guy messages me on facebook, or myspace, he needs to have (or invent) a reason to have a conversation. That's how it is in person too, right? You think of something to talk about, and then you talk about that. Sometimes you click, have a nice chat, exchange numbers and hang out later. Sometimes, there's no spark and you move on. It's the same online. Find something relevant to say, say it, and see what happens. But whatever you do: do NOT randomly write some woman and ask her to hang out.