I probably should have chosen a different title when I first wrote about Yahoo Buzz. According to comScore, Yahoo Buzz has actually overtaken Digg with nearly 7 million monthly unique visitors in the U.S.

As always, these metrics must be taken with a grain of salt; also, one must take into account is that Yahoo is one of the top 5 sites overall according to most metrics, and that all their projects get a really nice kickstart from all that traffic. But still, I didn't expect such stellar growth for Yahoo Buzz, which seemed - it still does, in fact - like a lightweight version of Digg for less tech-savvy users.

My smart friend Muhammad Saleem seems to have been right when he predicted that Yahoo Buzz is actually a big draw for publishers who will swarm at the prospect of being featured on Yahoo's front page, while at the same time being a nice option for less-than-hardcore social media users, which is most of the world's population.

Furthermore, Yahoo Buzz has a more diverse audience than Digg. While Digg's young, male, techy audience has been the stuff of legend since the site's beginnings, 51% of Yahoo Buzz's visitors are women. This doesn't matter much to the users but it does matter a great deal to the advertisers; another legend has it that diggers never click on ads, and this might not hold true for Yahoo Buzz.

Does all this mean that Digg is in some sort of trouble? I don't think so. Publicly available metrics such as Compete are showing growth, and the site still generates almost as much buzz as it did a year ago. Still, the success of Yahoo Buzz makes Digg just a little bit less untouchable.