How far back do you go when looking at someone's posts?

If I find the first few posts interesting, I'd go back as far as possible. I like to read posts that's more than just a one-liner, so if the first few posts are just one-liners, I get bored and move along. I'm not a big on comments, but sometimes I'd leave a comment. It's difficult to say how many posts it take to get to know someone. I guess it depends on how much they reveal about themselves in the posts.

It depends. If I like what I'm seeing, I'll often go all the way back and comment. If not, I stop at whatever point I feel I have sufficient reason to not continue further.