Judging by Quantcast, it's not correlated. Reddit has been steadily growing, and Digg just did a face plant.

https://www.google.com/adplanner/planning/site_profile?hl=en... makes it look like Digg lost about 750,000 daily users over the last year, in the same time Reddit added 500,000.

Obligatory disclaimer, not causation, FSM pirates vs global warming correlation silliness.

Still, instructive to see how quickly you can destroy your own brand and boost a competitor.

We saw about a 30% increase right after v4 was launched, and about most of those (25% of the 30%, or 83% of the increase) stuck around a week later. It's been basically normal growth since then.

I for one venture to reddit more due to what digg has become