A hashtag is a type of metadata tag used on social networks such as Twitter and other microblogging services, allowing users to apply dynamic, user-generated tagging which makes it possible for others to easily find messages with a specific theme or content.
Everyone agrees that hashtag is one of the most powerfull tagging technique. You must have notice all social platforms are being taken over by hashtags. According to Buddy Media one lonely hashtag can increase engagement by 100%.
Earlier I have shared you Instagram Hashtags, Here I am sharing you, most usefull Twitter hashtags.
Additional Read: How to Use the Power of Hashtags in Your Social Media Marketing