Fans fight back against Twitter’s algorithm change to propel Justin Bieber back into the Twitter’s Trending topics list.

Twitter has started to rollout the Local Trends to few users. The trending for cities/countries is basically to be based on the new Trend API. Using Local Trends, users will be able to view trends in their local cities or countries in additoin to viewing global trends.

Twitter has just released the “Top Twitter Trending Topics for 2009” on their blog. Not surprising, #iranelection is top of the list in News events, followed by Swine Flu (H1N1). The top trending topics for people included Michael Jackson and Susan Boyle.

Twitter adds a new feature to display description on trending topics to users for certain topics. The definitions are sourced from WhatTheTrend.com