It appears that the popular social bookmarking site stumbleupon has started banning sites that
are trading in exchanging votes/ stumbles etc.I knew this would be in the making after seeing so
many internet marketing forums with members doing just this.Have you or do you know anyone that
has been banned?
As per the TOS of Stumble Upon :
Are incentive programs allowed? Someone asked me to rate their web-site?
StumbleUpon does not allow personal accounts to be used for the purposes of incentivization or promoting sites. This would be considered a breach of our Terms.
The practice of sending PM’s encouraging or inviting other stumblers to rate/review sites in exchange for reciprocal reviews/ratings, monetary, or any other form of reward is strictly forbidden.
The practice of actively soliciting a rating or review for a site is also forbidden. Should you receive a PM, or encounter forum postings that breach this rule, you are encouraged to report this via feedback.
Accounts participating in such practices will be deleted and banned, and the related sites deleted and banned from the system.