I discovered and used StumbleUpon on my sites main index page, and a few deep pages, I started Sunday - after ranking great in Google all year, as of today my site has disappeared from the engine - StumbleUpon must trigger a sandbox curse, like a spam tool etc - Darn the flood of traffic for a few days was definately NOT worth the outcome of getting sandboxed for who knows how long again !
I think so to. Stumbleupon does not cause a sandbox effect because if it did many other people would be saying it here.
It has nothing to do with StumbleUpon. This problem hit lots of sites today... http://forums.digitalpoint.com/showthread.php?t=126276
I guess you guys were right, seems StumbleUpon was not the reason I got sandboxed, looks like Google does the flip-flop almost on a regular basis now. Thanks fellows for pointing out to me the other posts on the sandbox curse....
there is only one stumbleupon and i think the orignal poster has already said that he had made a mistake.
So you are telling me that I can index my competitors site on StumbleUpon and get the out of my way and in the "EVIL SANDBOX" I DON'T THINK SO!