cleaning out the closet on StumbleUpon

I have recently heard news about StumbleUpon banning several accounts because the users submitted comercial content. Here is the message these unfortunate stumblers usually received:

Regrettably, your account privileges have been suspended due to a breach of our TOS. I respectfully draw your attention to our Terms, particularly with respect to the clauses which forbid the use of personal accounts for the promotion of a business, product or service, and also with regard to the sending of ’spam’ messages to other members.

Our terms can be found here: http://www.stumbleupon.com/terms.html

Under the circumstances, the restriction is unlikely to be lifted.

Was it a surprise? For many yes, but if you take a look at their TOS, you’ll see these actions are strictly frowned upon. StumbleUpon is not for selling things, not for promoting an affiliate program, not for blatant product reviews, with a buy link.
Consequently, some of the people that befriended these “commercial accounts” can have some kind of flag raised.

So here are a few steps for cleaning your closet on StumbleUpon one of my friends, kukon,  let me in on:

• Take a look at the people you are mutual friends with. Click on the username without any avatar. Usually, when an account is under review, the display image or avatar is not displayed in the SU network. Remove that user from your friend list and the page will change to an empty one, if it’s the case, saying the account is reviewed.
• See what your friends are submitting or stumbling upon. Constantly submitting or thumbing up articles from certain domains can damage your account.
• Be an active user for the community. Try to submit things that are interesting to others, that have the potential to turn popular. Contribute and make yourself known to other stumblers!

Recently, StumbleUpon has also been banning websites that offered stumble exchanges. Here is an excerpt confirming it:
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.