what is a " hash tag" in twitter?

[Emily S]

well, i saw this on twitter and i was wondering what is hash tag...

[Spencer B]

its a # sign. jus used to write crap. like #ihateschool

[William Otto]

A hash tag is simply this- #. It is used to tweet random things that are popular going around the web such as #osamaisdead or #sittinondatoilet.

[Sean B]

. People use it to add a statement or categorize their tweet, if that makes sense. That way it shows up if whatever they put the # in front of is searched or shows up under trending topics.

[783]

It's to tweet trending topics. For example if #idontbelieveyou is the trending topic you'd tweet something like "My phone isn't getting calls...that's why I haven't been getting back to you. Really? #idontbelieveyou"

[Lyka Ricks]

A hash function is typically a single integer that possibly will work as an index or key to an array.