What was the hashtag originally used for?

I think, it was originally used for as a replacement for "number" or "N.O" so #1 means number 1.

The hashtag was originally called a pound key. The pound key was usually found on phones or home phones. It was used for operators. But now the internet uses the hashtag to tag certain people in a photo. I hope this helped you! 

Windows defender is an antispyware software.it does not work effectively if any other antispyware is added.

Net neutrality already has been repealed in the us. i don't think you'll ever need to pay for grammarly unless you want the premium option thing.