We recently wrote about Facebook's new publisher tools and how this will change the Internet forever (again). In the
article, we specifically mentioned that some companies, like
Yahoo! (specifically
Yahoo! Buzz) and
Digg need to watch out. We didn't know how fast this would happen. Digg dropped like a rock in April. This coincides with Facebook's roll out of their new social plug-ins. Look at this graph from
Compete.com:
Digg dropped from 38.6M unique visitors in March, to 24.7M by end of April. While 24.7M is an impressive visitor number, it is also a 36% drop in traffic... in just one month!
How do we know that this is Facebook's "fault"? We don't. We just applied some logical analysis in April, named a couple of companies that should be concerned and then looked at those companies again now. Maybe this is just a coincidence, we don't know.
Yahoo! Buzz on the other hand, made some strides in April, according to Compete.com. This speaks against our hypothesis.

Buzz climbed from 4M unique visitors, to 6M, which is a 20% increase in traffic. Maybe Buzz just has more overall momentum thanks to integration with Yahoo! sister properties? Thanks to that momentum, Buzz will either take longer to show a drop or, will just stagnate at its current level. Do note that Digg still has over 4x the traffic over Buzz. Maybe Yahoo! should pick them up?
WebGuild has some additional perspective on Digg, which you can read here.