Realtime Search Option, Latest Search is Disabled and Not Working
Recently google closed the Realtime Search option. They just temporarily suspended the option because the Deal with Twitter going to expire soon. Once Google reestablished the Deal the Realtime Search will get back.
Also Google says that
"We are temporarily shutting down the Realtime Search in Google. We are working on the service to integrate with Google+ project." So if Google relaunch the realtime search we may expect the realtime search result will have Google Realtime Plus and Twitter Tweets.