According to hashtags.org “hashtags” are a community-driven convention for adding additional context and metadata to your tweets. They’re like tags on Flickr, only added inline to your post. You create a hashtag simply by prefixing a word with a hash symbol: #hashtag.
Hashtags are getting more and more popular (despite the fact some people are against them wishing their Twitter stream to be metadata-free and “as human a form of communication as possible”). Using the sign # before a word, means that you want to talk about a particular thing (event, individual or place) on Twitter.
This is the way to tag a conversation so everyone can filter it using Twitter Search.
#hashtags.org is the first place to find most recent and hot hashtags. It also shows each hashtag popularity trend when you hover over.
These are some popular Twitter Hashtags:
#FOLLOWFRIDAY: This is about following other people in Twitter. You may suggest yourself to be followed, suggest others to follow and just say who you just added to you list of followers.
#UNFOLLOWFRIDAY: This is about removing from the list of followers. You may suggest people to be unfollowed or just mention who you removed from your list of following.
#TGIF: Thanks Good Is Friday. This is used to say anything on Friday.
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