Facebook reveals alot about somebody through their photos and profile. Adding someone on Facebook can or cannot work against you. The advantage of adding your date to Facebook is you can learn alot about them and can save you time going ahead with the date if they don’t come across well. If you reveal your real name on a dating site, there is nothing stopping your date looking you up on Facebook. My general advice is if your Facebook profile puts you in the best possible light then go for it. Otherwise I wouldn’t bother. Another approach, which requires a bit of work, is to create a list on Facebook with a limited view on your profile to just highlight the parts of your profile which put you in a good stead.