Twitter
1,822,727 websites

Twitter is free to use

https://twitter.com

All Twitter's social tools, including buttons and timeline widgets.

VS

VKontakte Widgets
13,285 websites

VKontakte Widgets is free to use

http://vk.com/developers.php?p=Comments

The VK comments widget lets you add comments to your site in a matter of minutes. Installing the ... Read more on the advantages of the VK comment widget. 1.

Market Share by Top Websites

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

2 In terms of market share, VKontakte Widgets is clearly lagging behind, losing to Twitter in all segments.

Websites Categories

1 Twitter has better usage coverage in more websites categories. Including Arts & Entertainment, Computers Electronics & Technology, Science & Education, Games and 20 other categories.

2 VKontakte Widgets hasn't got a lead over Twitter in any websites category.

Geography

1 Twitter is leading in most countries, including Japan, United States, United Kingdom, France and 162 other countries.

2 VKontakte Widgets hasn't got a lead over Twitter in any country.