Every time I bring up Alexa, I get a ton of people who tell me how unreliable and worthless it is. Let’s assume for the sake of this piece that I know this. Let’s also assume that my budget for gathering data is zip and Alexa and Compete are the only real options.
With that out of the way, Alexa is showing major drops in reach for Digg, StumbleUpon, Reddit, and Mixx and other social bookmarking sites. They are all happening around the same time. Concerning? Not at this point, since the data is all very young. Worth monitoring? Absolutely.