Hashtag

A word prefixed with '#' that groups posts by topic. Chris Messina proposed it on Twitter in August 2007; it became the most widely used folksonomy, a vocabulary made by its users rather than designed in advance.

builds on

• Folksonomy concept 2004 [src]

proposed by

• Chris Messina person [src]

Sources

• https://en.wikipedia.org/wiki/Hashtag