] Owners of the conversational websites known as weblogs
] have recently noticed that their referral logs have
] become the newest target for spam.

] Referral logs, intended to collect information on who
] visited a website and how they happened to arrive
] there, are being stuffed with bogus links. Curious
] bloggers who click on a logged link to see who
] visited their site are instead led to pornography or
] advertising sites.

MemeStreams receives lots of referral spam.

BTW, whoever wrote this article is kind of an idiot... These are not REAL refferals, so they don't have any impact on your google ranking. (duh!)

Wired News: When the Spam Hits the Blogs