How long do you have to be reading someone's blog before you can call them your "friend?"

Seriously, is it ok to refer to "my friend's blog" if I've never met them?

I do that sometimes. Because it sounds kinda weird when I want to talk about a blog of someone that I don't know....

I dunno, does anyone else feel this way? Or am I the only one?

Blog stalking is one of my favorite past times. I think I might like it better than facebook stalking...