LinkedIn and Facebook: Personal Vs. Professional in the Identity Wars. Which would you prefer when billing?

As described in its blog post and on its developer site, the LinkedIn platform includes virtually everything that Facebook launched last year: the ability to log in with your LinkedIn identity, a feature that shares your profile from the network with other sites, the ability to click a “share” button and send content back to your LinkedIn contacts, and a “recommend” function that lets users recommend a site or services to their friends and connections.