Great post and and a huge win for Facebook. However this point about there being little traction on the shop or factory floor is not really accurate. The very best examples of ESN successes tend to come from the frontline — retail, restuarants etc. Microsoft have dozens of great anecdotes about this for Yammer. So… while Walmart is truly a massive business to be doing this, and the behaviour will be fascinating to watch if/as it takes hold, it’s a long way from being a new thing.