The A-Z Dictionary of Educational Twitter Hashtags | Edudemic | Into the Driver's Seat | Scoop.it
From edudemic.com - December 14, 2011 12:03 PM

The # symbol, called a hashtag, is used to mark keyword or topic in a Tweet.

 

Any Twitter user can categorize or follow topics with hashtags.Those hashtags (usually) mean something and are a great way to get a tweet to appear in search results or discussion monitoring.


Via Gust MEES