Twitter recently launched a new feature called "Who to Follow" where they display a list of suggestions of people you should be following on Twitter based on certain algorithms. Though this feature could be handy once in a while, it is always in your face whenever you visit the twitter web interface.
Now the problem here is that Twitter does not provide users with an option to disable the suggestions list, and you will have to either use a browser extension or Greasemonkey script to disable the "Who to follow" suggestions box on the Twitter web interface.
Google Chrome users have a choice with two different extensions which will allow you to disable/hide or move the "Who To Follow" suggestions box. The Hide Twitter suggestions extension completely removes the suggestions box, whereas the Hide Twitter suggestions PLUS extension will move the box to the bottom of the sidebar so that it is not in your face every time.
If you are a Firefox, Opera or Internet Explorer you can use a user style to hide the "Who to Follow" suggestions box in Twitter. To do that, open this link in the browser you are using and choose the options provided to you. If you are using Firefox or Internet Explorer you might need to install additional software or add-ons for your respective browser in order to use the User Style.
That’s it, till Twitter provides a way to disable the "Who To Follow" suggestions, you could use this trick to hide it from your web interface.