"Love Spammers" are the term applied to accounts created with the purpose of friending and sending out messages to other users on DDO. The goal of these messages is to send a link to a "spam site", generally an advertisement or malware (or combination) site.
Specifically, Love Spammers send a message with some variation of "I love you! Click this link:" followed by what is an obvious spam link to any internet-savvy user.
Love Spam received should be, and generally is, immediately reported to the mods.