"Disqus, which this week celebrates four years of existence, raised the $10 million with North Bridge and Union Square Ventures. In its blog post today, the company said that it's all about the numbers. But what are those numbers?
Disqus says that it reaches nearly 500 million unique visitors per month across the 750,000 websites using its commenting system. Over the last year, that's an increase of 500%, with much of that growth in recent months. As a matter of fact, the company says it was at only 200 million uniques per month last November, meaning it has more than doubled unique visitors in six months. The post also mentions a recent study by Lijit, which it says that Disqus is used by 75% of websites that use a third-party commenting system."
Doesn't mention Tumblr: how much of the growth is Tumblr-related? Tumblr should acquire.