Erick Schonfeld submits:
When Google CEO Eric Schmidt mentioned a few weeks ago that the M&A spigot is now back on at the search giant, he wasn’t talking about a trickle. Monday’s announced deal to by mobile ad startup AdMob for $750 million is Google’s (GOOG) largest acquisition since its $3.1 billion purchase of DoubleClick in March, 2008, and its third-largest ever after the $1.65 billion YouTube acquisition in 2006.