Tumblr
386,778 websites

Tumblr is free to use

http://tumblr.com

Tumblr is a re-envisioning of tumblelogging, a subset of blogging that uses quick, mixed-media posts. The service hopes to do for the tumblelog what services like LiveJournal and Blogger did for the blog. The difference is that its extreme ...

VS

vBulletin
7,250 websites

vBulletin costs money

http://www.vbulletin.com

vBulletin is a professional, affordable community forum solution. Thousands of clients, including many industry leading blue chip companies, have chosen vBulletin - It's the ideal choice for any size of community.

Market Share by Top Websites

1 Tumblr is leading in Top 1M Sites and The Entire Web.

2 vBulletin is leading in Top 10K Sites and Top 100K Sites.

Websites Categories

1 Tumblr has better usage coverage in more websites categories. Including Arts & Entertainment, Adult, Games, Lifestyle and 20 other categories.

2 vBulletin hasn't got a lead over Tumblr in any websites category.

Geography

1 Tumblr is leading in most countries, including United States, Canada, United Kingdom, Germany and 145 other countries.

2 vBulletin is leading in Iran, Syrian Arab Republic, Yemen, Mali and one other country.