Hacker News Reader

"According to comScore, Twitter.com had 22.3 million unique visitors in March, up from 524,000 a year ago"

The 524,000 figure looks fishy. Compete.com puts Twitter's April 2009 unique visitors at 19 million (versus 21 million for April 2010).

Compete's stats are WAY off. At least for my sites. I suspect they are for others too.

Could be, but given the Twitter hype last year, 524k seems off by an order of magnitude at least.

I agree, I don't think 524k to 22.9m sounds even remotely reasonable. Twitter was larger than that last year, and did not grow by 4400% in one year.