im not getting harassed per say on xanga, but i do have a nasty mystery commenter who i have a feeling about the identity. it would be great if i could compare IP addresses and find the culprit. is it possible for me to do this or not? and if so, how?

is this mystery commenter comenting on your chatterbox?

is this mystery commenter comenting on your chatterbox?
i have the same problem and it is annoying...help!!! can that person/isp be blocked?