You can share valuable recommendations with your Hotpot friends and across Googles products in search results, on google.com/hotpot, and on Place pages. You can now quickly search for the right place to check in using thebutton. Youll get a preview of your tweet and will be able to post your ratings and reviews moving forward. Starting today, if you see nearby Latitude friends on the map and want to ask them where they are, you can quickly ping them.”]
Source: http://googlemobile.blogspot.com/2011/03/tweet-your-hotpot-ratings-in-google.html