Twitter, which is regularly presented in the ratings of brands, the most mentioned in social nets, announced its version of the top trending topics of 2009 (pic.).

As in the corresponding search engines’ ratings the most mentioned and talked about person is Michael Jackson, the most popular hashtag is #musicmonday, while the most important news topics were about Iran and swine flue.

At that, according to Twitter, Iran is presented in the most important news topics even with three subjects and hashtags: #iranelection, Iran and Tehran.