Washingtonpost.Newsweek Interactive, the digital media arm of WaPo has made an early-stage investment in SocialMedian, the yet-to-launch social news company/site founded by Jason Goldberg, former chief of Web 2.0 jobs site Jobster.com. The amount was not disclosed. We reported earlier on his $1 million seed round raise. Even though you may groan on hearing about yet-another-social-news-site, Goldberg tell us that “It’s not yet another Digg clone. Rather, it’s a fresh new take on delivering more personalized news inspired by people with similar interests. We’re very focused on building a mainstream mass-market better news-getting experience for anyone/anywhere.” Proof is in the pudding…

Allen Morgan, a managing director at Mayfield (and an investor in Jobster) is on the advisory board of the company.