Often when you get an email from someone online Google gtalk (on mail.google.com) starts showing that contact in your frequent friends list. That increases the size of your friends list and takes up too much real-estate in browser. Here are quick steps to remove that contact form this list.
- Mouse over that contact in your browser and you will see contact options as shown in the screenshot. Click on more options icon at bottom right of the option screen.
- Click on never show as shown the following screenshot.