The hash has been around for a very long time, it's always riding the zeitgeist, a trendy so and so. One small symbol has come to represent instant access to topics of interest, in the here and now.
Utilised by Twitter for years, Facebook have now introduced it. This is no small addition to Facebook. It actually has very significant consequences.
Is Facebook about to become Twitter? Will it steal Twitter's real-time, instant access USP? And will it add a whole new dimension to its behavioural targeting capability?