In a great IT industry irony, ESN (enterprise social networking) software, designed to boost interaction and collaboration, is often ignored by users and ends up forgotten like the proverbial ghost town with rolling tumbleweeds. The promise of a successful ESN deployment is appealing to businesses: implement a Facebook- and Twitter-like system for your workplace, with employee profiles, activity streams, document sharing, groups, discussion forums and microblogging, and watch employee collaboration bloom.