| Website | nielsen.com |
| Category | Consumer Web |
| Phone | +1 646 654 5000 |
| Employees |
| Total | $327M |
| Koreanclick, 9/09 | |
| Telephia, 6/07 | |
| NetRatings, 2/07 | $327M |
| Buzzmetrics, 1/06 |
Nielsen is an audience measurement firm that tracks TV, internet, and radio usage worldwide.