Google Realtime Search is on hiatus since the company's contract with Twitter, enabling access to the full feed of public updates, expired on July 2, 2011.
While the unique Twitter feed has been suspended, Google notes that the publicly available information on Twitter is still available and searchable on the Google search engine.
Google plans on relaunching its real-time search with access to content from various sources including Google+ information, although the date for this relaunch has not yet been set.
Hopefully it will come soon, because with the suspension on Google Realtime, there is no way to find tweets further back than a few days, as Danny Sullivan of Search Engine Land notes:
Twitter has largely outsourced the service of Twitter search longer than a few days to Google, a deliberate decision so that Twitter could focus on other search features, such as its new Top Tweets feature
Access to old tweets will have to be done on Topsy, the small search engine that seems to hold the only major Twitter achieve available.
I’m looking forward to the new and improved Realtime Search. What changes do you suspect we’ll see?