James Hong put up a long post today about reinventing HotOrNot. I am a big fan of the company. After resting on its laurels for a while, HotOrNot has revved back up in the last few months, making its Meet Me online dating service free, and diving head first into Facebook.
As a result, HotOrNot is one of the four companies with multiple successful apps in Facebook.
Its move to free has also paid off in a big increase in traffic (James claims that traffic has doubled in the last 3 months to about 20 million page views per day), as can be seen from the Alexa graph below: