This March 25, 2008 file photo shows the sign for Google headquarters in Mountain View, California. US Internet giant Google is in negotiations to acquire micro-blogging sensation Twitter for over 250 million dollars, technology blog TechCrunch reported on April 3, 2009. Citing two sources familiar with the matter, TechCrunch said Google would be making an offer below the 500 million dollars Facebook proposed to Twitter a few months ago, and would pay in cash or publicly valued stock.