With Twellow you enter a search phrase, like “cleantech.” It searchs, then lists Twitter users with that interest. You can view information about, then click to Follow. They also have a hierarchical directory of Twitterers by category, and lots more features too. This is a great way to find people of Twitter with interests similar to yours, or to research a topic.
Politics in the Zeros
"A republic, if you can keep it." Defeat MAGA
Politics in the Zeros
"A republic, if you can keep it." Defeat MAGA