Microsoft's Bing search engine has only been live for about a month, but already its traffic is healthy, with nearly 50 million unique US visitors in its first month.

That's more than social media luminaries Digg and Twitter, and bigger than news website CNN.com. It's the 13th most visited website online, according to stat-tracker Compete's figures.

However, one slight embarrassment is that Bing's predecessor - Live.com - is still beating its younger brother in terms of traffic - gaining nearly 80 million unique US visits in June. That's probably because Hotmail still exists at mail.live.com, but it's still a little awkward.

Of course, Google and Yahoo are still way out in front, so Bing's got some way to go, but at least it's on the right path.