Notifications keep you up to date with your own account as well as the people and brands you track. By tracking your favorite Twitter accounts, we can inform you when they're about to reach a certain amount of followers or tweets, or when they've reached a milestone! It's a good way to follow the growth of specific users.
To get notified on your own or another Twitter account, search for any account your are interested in and simply click on the 'Track' button on the profile page.
To change the settings for the notifications go to: