Hash Tag

way to identify a "special" word by prefixing with a hash '#'.

First used in Twitter in Aug'2007 for BarCamp. Ironically, Twitter founder Evan Williams once told Messina that hashtags were too nerdy to go mainstream and that Twitter would use Machine Learning to group Tweets together automatically by topic instead. The use of hashtags before Twitter was most common (though quite different) in IRC, which was part of Messina’s inspiration but admittedly a nerdy milieu.

use a WikiWord instead?