I kind of disabled that feature to save some bandwidth.
"Stephen Wolfram is the creator of Mathematica and is widely regarded as the most important innovator in scientific and technical computing today." - Stephen Wolfram
It uses way more bandwidth to import an image from your computer (such as the bandwidth-crippling avatar) then it does to link it to an image online. I am sad about the destruction of the attachment feature since it was one of the only ways for me to post certain pictures. I guess it may be due to it's abuse, misuse, etc. by idiots who saved the file and then attached it rather than just linking.