There is a certain user in DA known as "Jannetcresbgp", this user goes around commenting on random deviations saying:
"Nice! Check this out: [link]"
Along with a link. And I warn you, DO NOT CLICK ON THE LINK! It'll take you to a pornography website that may contain harmful viruses that could kill your computer. PLEASE SPREAD THIS AROUND DEVIANTART SO THAT THE MODS CAN FIND OUT AND BAN THE USER!
If this person comments on your profile, flag his comment as spam and report him A.S.A.P.
Spread the word.