Social Bookmarking Sites

Do they convert well for advertisers?

[maxgoldie]

Sometimes social bookmarking sites* can deliver enourmous amounts of traffic, somewhat like a "Slashdot Effect" -- but does this kind of traffic convert well for advertisers?

Any experiences with this? Or.. is this really niche-contingent?

*like for eg., Digg.com, Furl, Linkfilter, Delicio.us, etc..

[pacman2]

don't have xp with this, but you must very valuable content to be linked from these sites, so it's not for everyone...