The online space and its obsession with reviews have been mostly relegated to the B2C space. LinkedIn, which is the networking / social media place for 'professionals' (whatever that means) is seeing that their audience needs some review help as well. It makes sense. If you want someone's opinion about a restaurant then why not seek it out for an accountant? LinkedIn has purchased the start up ChoiceVendor as reported by Bloomberg Businessweek . ChoiceVendor,