Ah I only used Digg and never heard of reddit till Digg died and never joined most of the big subs. But also reddit was so small back then a small bump is a good kick start. Google trends data correlates with what I saw Digg was more search for in 2008 then by 2011 Digg was dead after the 4.0 debacle in 2010 and reddit took off in 2011.