Posting here doesn't seem like the right way for me to bring this up; I'm following the accepted answer from this Meta question, which states that posting here is as good a way as any to bring this kind of issue to someone's attention:
You have several options:
- Flag vandalism (you can use the 'other' field to specifically explain what the user is doing), or in the case of vandalism in answers/questions, flag and downvote the post (source)
- Send an e-mail to
- Make a meta post here (source)
Considering the business of the mods (see Sha Wiz Dow Ard's comments below), 1. is probably plenty, don't bother with 3. unless it's something frequent, serious, and disruptive.