Script Summary: Too many posts in your dashboard but don't know who to unfollow? This script helps you find who is posting the most to more effectively trim your following list.
To use the script, go to your following list and click on the text that says when they last updated. (For example: "Updated 1 hour ago") After a second, the text should change to their average posting rate calculated over the last 100 posts. (If they have less than 100 posts, the text will not change. This value is easily changed in the source if you desire.)