Market Share by Top Websites

1 Nielsen NetRatings is leading in Top 10K Sites, Top 100K Sites, Top 1M Sites and The Entire Web.

2 In terms of market share, Topsy is clearly lagging behind, losing to Nielsen NetRatings in all segments.

Websites Categories

1 Nielsen NetRatings has better usage coverage in more websites categories. Including Business & Industry, Arts & Entertainment, Marketing & Advertising, People & Society and 218 other categories.

2 Topsy is leading in Addictions, Alternative & Natural Medicine, Weight Loss, Crafts and 4 other categories.


1 Nielsen NetRatings is leading in most countries, including Italy, United States, Australia, Spain and 166 other countries.

2 Topsy is leading in Japan, Angola, Martinique, Micronesia and one other country.