Twitter separates tweets into categories using “hashtags,” keywords that start with the “#” character. However, hashtag searches are broad and don’t emulate the groups on social networking services like Facebook, or the “newsgroups” that were the heart of the early Internet. If you want to focus the tweets you receive onto a specific topic or community, you can use any of several free third-party services that allow users to create and join Twitter groups similar to those from other social networking services. Writer Bio
