They went from just under 30k submissions a day to just under 80k submissions a day in 2 years. That's 166% growth in 2 years. That's not "slowly" Further, y

They went from just under 30k submissions a day to just under 80k submissions a day in 2 years. That's 166% growth in 2 years. That's not "slowly" Further, you'd expect growth of submissions in a "best rise to the top" system to be lower that growth of overall use. A traffic chart, or a chart of the total number of votes (not just upvotes) would be a far better estimate of their true growth.