What the fuck is a hashtag? Younger generation gone crazy

in #hashtag9 years ago

Can someone please explain what a hashtag is? I know its the symbol but that's about all I know.

I see it on TV all the time on the "big bang theory" they use it in jokes and stuff.

What is it purpose and function?

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My wife who teaches 5th grade had a student make the comment about her room phone. "Why do these old phones have hash keys? You can't use this to post on twitter!"

thats gold