While showing the lovely lady exactly how he smoked her, he seemed to have an additional social network available to share to besides Windows Live, Facebook, LinkedIn and Twitter.
He also appears to have the option to share via the Ben the PC Guy network. One wonders what other Microsoft luminaries inhabit this network.
On a more serious note, the entry suggests that this feature is extensible without major effort, hopefully by third parties eventually, which would be useful in supporting the large number of regional social networks not covered by the regular list. Hopefully this is a feature we will see turn up in Windows Phone 8.
Update: OK, it may simply be a renamed Windows Live account, but if anyone deserves their own social network, it would be Ben 🙂
Thanks Aquiles for the tip.