So far I've had three girls say this to me already, each of them I'm almost sure were very much attracted to me. This seems to be something that girls do, in general. What does it mean?

Please respond with some actual introspective illumination on why a girl would do this, not some bullshit that says "she just wants to be your friend". Obviously we know women talk in coded language.

I've considered that it might be for their own sake, to convince themselves they don't like you. That's really really unlikely. I'm thinking it's to send a messahe to me, rather than to themselves. I think it might be to show you that they are not "easy", that you don't have them already (a sort of shit-test), and at the same time displaying that they appreciate you (in my case, everytime it was said it was done in an appeciative manner).

What do you guys think? I'm sure this is a very very frequent thing... now that I think about, I think a fourth girl has said this to me online as well. Currently Ive been responding with a "haha for now!"