Twitter tracker. Be careful and check that twitter accounts exist and are not private. Usernames should be in lower case! You dont have to input all accounts right away, you can buy as many as you need and they add and change targets later on. It takes few minutes for new targets to sync.
Custom streams let you control the feed.
You define the data you want to track. Provide your own targets, and this stream will monitor them, delivering real-time updates tailored to your needs.