Does StumbleUpon Crack Down on SEO Already?

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Today I was surprised to see that over at StumbleUpon 4 users reviewed my ode to the SEO community in the 20 Sphinn stars post and overall 12 stumblers liked it. Why was I surprised?

I was taken off because I did not notice any traffic whatsoever on this post from StumbleUpon. Usually so many “like its” bring something like 1000 visitors.

At first I thought that probably just my StumbleUpon friends voted for me and SU did not count them to prevent spam. Then I took a closer look at those who stumbled and reviewed SEO 2.0 here: The only thing they all have in common is: SEO. Only roughly 50% are my friends at SU. 5 of them are my friends, one is a fan of mine, and I am fan of one those 12 stumblers. So it’ still 12 vs 7. So it can not be about the friends.
All of them are SEO stumblers, people who stumble SEO posts from several well known SEO sources. None of them is a “SEO spammer” though. All of them are genuine active StumbleUpon users. So why didn’t I get any traffic? Did StumbleUpon decide to give us some AIDS 2.0 like the SEO haters who bashed me there?

It’s no mistake unfortunately, I checked all three stats that run on SEO 2.0. The numbers are valid. Moreover I still get significant traffic for other posts who have been stumbled before so this is not a ban against the SEO 2.0 blog by itself. It’s a crackdown on the SEO stumblers it seems.

Did you experience something similar on SU? Or am I the only target? If this is true, it seems that StumbleUpon strikes against the good SEOs instead of the bad ones, those who truly contribute to StumbleUpon get punished for practicing SEO.

Btw. sometimes the SU traffic takes a while after a posts get stumbled, something like 2 hours. The Sphinn stars post was stumbled by Lyndon 24 hours ago in this case.