Can't say that this was much of a surprise. BuzzMetrics and The Nielsen Company announced today that Nielsen will acquire the rest of BuzzMetrics. Given that Nielsen already owned most of BuzzMetrics and had put its name on the service, this should reduce some confusion. I guess it explains an offhand comment about the challenges of integration, too.
Upon completion of the BuzzMetrics and NetRatings transactions, Nielsen's premiere Internet information services—which are marketed as Nielsen//NetRatings and Nielsen BuzzMetrics—will be consolidated into a single service unit.See the insider comments from Jonathan Carson, Pete Blackshaw, Max Kalehoff and (insider emeritus) Matt Hurst.
You can find a complete roundup of mergers and acquisitions in the industry in SMA's acquisitions scorecard.