Facebook - why do you talk with someone on his wall, instead of over PM?

<p>I don’t know if this is just me, but I tend to unconsciously judge people based on how many wall posts they have. If I see a profile with ~5 posts, I’ll assume that the person is either new to Facebook, or that they simply don’t have very many friends (whether it be friends who use Facebook, or friends in general). If I see a profile with 2000 wall posts (yes, I have actually seen this), I’ll assume that the person has a lot of friends who use Facebook, and I might also assume that the person spends way too much time on the computer.</p>