LinkedIn Valued at $1 billion

LinkedIn, the popular online business networking tool, recently received another round of venture funding, led by Bain Capital, which valued it at $1 billion.  While this doesn’t make it the highest valued social networking site at present (Facebook holds this title, at $15 billion), the valuation does lead to some pretty high expectations.  The FT has an article on the valuation but more interesting is this back-of-the-envelope breakdown, posted at the blog GigaOm, of whether LinkedIn is really worth that much.