New York-based mediaco Nielsen already owned 58% of BuzzMetrics, the tracker and analyzer of online consumer-generated media. Yesterday, Nielsen announced it was buying the rest, a deal that’s expected to be completed by the end of this month. Nielsen also owns 60% of NetRatings, and plans to buy the rest by the second or third quarter of this year.

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. The new service will be led by Itzhak Fisher, executive chairman of BuzzMetrics.

Nielsen chairman/CEO David Calhoun says the deal will allow the company to ‘provide our clients with unrivaled understanding of consumer behavior in this space. More broadly, we can provide our clients with even more insightful information when Internet/online consumer usage is combined with what products and services consumers buy (ACNielsen), what consumers watch on television (Nielsen Media Research), and what books, films, audio and video usages consumers interact with across multiple platforms.’