The hashtag has in the recent years been catapulted to widespread fame due to its extensive use in popular social networking websites. While it was earlier known as the pound symbol, it is now commonly used as a means to group together certain pictures or tweets by virtue of category. The symbol (#) is placed directly before the text such as in the widely popular #TBT which basically stands for Throwback Thursday as per which people generally upload pictures that they might have taken some time back.