What is Hash Tag? We'll for me the word "HASH TAG (#)" indicates a trending topic or is being used to point a specific topic. This is being used or included when someone posts blog or messages to different social media like FB,Twitter etc., and also here in our very own "Bitlanders". If I'm not mistaken using this symbol was being famous in Twitter.
So, to check the real meaning of this, check this link "Hash Tag"