Hahaha! I was just reading Barney Stinson's explanation on the origins of the Three-Day Rule (See How I Met Your Mother). I think that Urban Dictionary has a better explanation of it as a lame head game that guys play with girls. I'm definitely a fan of getting some momentum going rather than worrying about coming across to strong.
I like building suspense, so the question and qualification game from tmalonetn is great. I'm going to set up a secondary Facebook account for playing around with women. Don't need PUA getting mixed up with the same account I use with co-workers and family. Generally I create a little suspense with gals by not telling them where I work. Once I was doing this and the gal turned out to be a co-worker who works in a different department.