you can select whether or not to see what people have chosen to paste at the bottom of their posts:

on your Home page, or Profile page, you select Customize Profile, and on the left side of the next page, you will see a long menu list...

about halfway down that is Edit Options... select that and you will end up on the page where you customize your availability to other members , n stuff,,,

about halfway down, (under "Display Options"), you'll see a box with Show Signatures;

Select that and a check mark will appear, and you will see what people have pasted at the bottom of every post.

UNcheck that, and POOF,, all those pesky signatures vanish~!!