- February 2005: VNU (owner of ACNielsen and Nielsen Media Research) acquires an equity interest in Israeli-based Trendum, a leader in media and linguistic analysis technologies.
- September 2005: Trendum acquires BuzzMetrics; the new company adopted the BuzzMetrics name.
- January 17, 2006: BuzzMetrics acquires Intelliseek. The combined company, BuzzMetrics, Inc., will operate under the Nielsen BuzzMetrics brand. [source: Nielsen BuzzMetrics]