hashtag is a rather popular concept in social networks. most of us use social networks but few people know, hashtag marks quite an important role in online advertising campaigns,
in recent times you've probably heard of the hashtag phrase. this is an interesting way to use it on some popular social networks like twitter, google+, and youtube. the sign to
the hashtag starts with '#' and the keywords are written together. when a user clicks on it or the search will display the results including the status updates, postings, images