I guess I can be kinda paranoid, but I always have an escape plan, even when I meet someone at a bar, club, or over the internet. It usually goes down like this (feel free to modify if necessary):
1. Club/Bar setting: Get to know one of the bartenders/security/staff/etc. because 99% of the time they know the person that wants to hangout/etc. with you afterward (also go with a friend who's been to the club a bit that you know and trust). If they are a regular, chances are they know them, what they are like, who they hang out with, etc. Also make sure to tell a friend where you are going at all times and point to who you're going with (even if it's a different location in the club) so if you go missing, they know who to look for and such. Also make sure if you know where your drink is and NEVER leave it unattended!
2. Internet: Always, always, always always make sure to meet in a public and safe spot. I would try for the movie theater and meet inside, not outside. Also go with your gut, if you don't feel comfy or you feel weirded out, leave. Don't give an excuse, just leave. Another thing is to always let someone know whats going on. I would usually bring a friend with me and tell him to do the same, just to be safe and such. Also, never go out right afterward unless you feel its ok, and not because the other person says so, and even then make sure to tell someone.
It is extremely important that you tell people where you are going, who you are going with, and give as much information about the other person as possible. If the otehr guy gives you his cellphone, give his cellphone number to a friend. Text your friend with updates (i.e. goin into the movie, leavin now). I know this wounds paranoid, but I think this is the safest. I also know this works, because when I told my last ex about what I did, he thought it was a little overboard, but then realised, after looking at statistics, how much it was worth it.
So yes. Have an escape plan, meet in public, and tell someone you trust, and give small updates. I know it sucks to say this, but you can never be to careful anymore

Eric