Spurl being spammed

The homepage of Spurl has the following message on it:

Limited feature set:

We are currently forced to offer reduced functionality due to heavy spam attacks. The lists with New and Hot spurls are therefore disabled until further notice.

All social bookmarking sites get used by internet marketers, spammers and good content providers alike, they all get this abuse. The problem is how do you filter the service without harming it, I imagine it is going to take a Google like approach and that can be painful.

Spurl is not my favorite for IM tasks, I know of a couple that rank much better (and faster) in Google, but it is good and quite popular. I would feel a bit guity if that was all I used these services for, I feed them other content for that reason and I imagine when the filters hit, I won’t get a slapdown when they come (fingers crossed)!