I highly doubt that most adcom members visit SDN to try and bust applicants. However, if adcom members read posts crapping all over their schools, this could certainly pique their curiosity. While it's unlikely that adcom members will be so concerned that they take the time to track down the users of these posts, there have been rare cases when members of med school administrations took disciplinary action on their students because of some posts these users made on SDN. No joke.
You can rest assured that those with access to SDN users' IP addresses and other personal information (i.e., the mods/smods/admins) are not privileged to provide such information to admissions committee members or anyone else on SDN for that matter. This would violate our Privacy Policy.
Don't post any personal identification information (your real name as your screen name, MDapplicants, Facebook, MySpace, photos, MCAT/GPA/major/college combos, etc.) if you don't want it linked to your account. On the other hand, if you feel that you've got nothing to hide, then feel free to include whatever personal info you wish.