writes As social networks proliferated in the early '10s, so did the idea of a corporate social network — a Facebook-like community on an intranet where employees could interact. Unfortunately, corporate users are staying away in droves, perceiving the systems as one more in-box they'd have to take care of and getting their social-networking fix from Facebook and the like.
From what I've seen of these internal networks, another good reason is that they're not as good
as the full-time social networks are, and offer access only to a small universe of particpants anyhow. They're like a central-casting "rock band" in '80s movies — they come off as conspicuously aping the real thing.