Joining an existing conversation on Twitter is as simple as finding the trending topics and Tweeting your two cents. The best way to find out what is trending is to sign into your Twitter account and look at the left-hand side of the screen to see the top 10 trending topics. These will be shown as hashtags. Simply click on any of the hashtags to take a look at the current conversation around those topics. Then, either reply to an existing comment or compose a new Tweet using that hashtag. If you are not sure what a hashtag refers to, go to whatthetrend.com to learn about the trending topic.