Empire Avenue not only puts a valuation on your social media activity, it also allows friends to buy into you. It works like the stock market - the more involved you are in social networks such as Twitter, Facebook, Flickr and your own blog, the higher your Empire Avenue valuation. Spending less time on Empire Avenue and social media will result in your share price dropping.
In addition, your peers can purchase shares of you if they feel you're undervalued, or sell shares if you're overvalued. Both work to raise or lower your social value.
Empire Avenue answers the question "What are you worth?"