If you haven't yet found a reason to viralize your links, this might push you
 

Social network use triples in over a year: http://blog.nielsen.com/nielsenwire/...-advertisinga/ People are spending more time and going deeper into social network sites. HUGE advertising opportunity. Indeed, advertisers have begun to notice:

Among those taking note of this trend: advertisers. Estimated online advertising spending on the top social network and blogging sites increased 119 percent, from approximately $49 million in August 2008 to approximately $108 million in August 2009 ? all despite a recession. Share of estimated spend on these sites has doubled, from 7 percent of online ad spend in 2008 to 15 percent in 2009.