I notice allot of businesses just don’t know what hash tags are, what they do, and the value of using hash tags to identify sessions. I agree that hash tags are best when used in under 7 characters. However, preferably under 5 characters.
Last year, we saw the emergence of the technology PubSubHubbub, which provides real-time notifications to subscribers of content when there is new content or updates being made. There has recently been allot of talk about Google developing a system that would use this technology in its indexing process. Matt Cutts recently clarified this in a video with WPN.
From: http://daggle.com/sxsw-hashtags-wild-1761
