Chris Struhar on Facebook Newsroom said, "the feature is designed to surface interesting and relevant conversations in order to help you discover the best content from all across Facebook".
The update will be rolled out to selected countries including India, UK, US, Canada, and Australia in the coming two weeks, which will be followed by a launch in other countries later. A launch on the mobile app is also expected soon.
The trending topics will appear on the top right corner of the Facebook Page and will be based on your interest as well as the topics making a wave across the social network in general. By clicking on the trending topics, you will be taken to the posts shared by your friends or the pages that are talking about the trending topic.
Ads to Soon Target Hashtags
It is also expected that Facebook will soon let the advertisers target the ads on the basis of hashtags that people are using in their updates.After Hashtag, Facebook Launches Trending Topics!,