In twitter, there are certain things to know so that you can used your twitter profile in a proper way and also it helps you to get huge followers. Here are three things : 1. hashtag : A # symbol added before a keyword in a tweet, allows multiple tweets on a tropic, to be viewed at the same time. 2. @reply : A reply is any update posted by clicking the "Reply" button on a tweet. 3. @mention : adding a twitter name to a blog or post.