The $50 billion valuation triggered by Goldman Sachs’s investment in Facebook has created another feeding frenzy. The Guardian has a nice piece by Jemima Kiss which manages to steer clear of most of the hype. Meanwhile, here are two charts which may help to put things in perspective.

The first shows the way valuations of Facebook have fluctuated over time.

The second — more sobering — chart shows revenue per user for different online services.