twitter question
 

what exactly is a hash tag ?

A hashtag is a type of label or metadata tag used on social network and microblogging services which makes it easier for users to find messages with a specific theme or content. Users create and use hashtags by placing the hash character (or number sign) # in front of a word or unspaced phrase, either in the main text of a message or at the end. Searching for that hashtag will then present each message that has been tagged with it.

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

# = hashtag

It's used as basic tag across various social media.

so basically its a medium to alert people of a current trend or popular wording that is circulating the internet