$500 million is 4 times as much revenue as Facebook anticipated for last year.
So if this company makes 1/10th the profits of Facebook, it will take 50 years to make enough profits to cover it's current valuation. Of course, if this company is as profitable as last-year's-Facebook then their total profits will exceed their valuation after 5 years.
So I guess the question then is whether social-networking apps have the potential to generate similar revenues to the big social networking sites.