Hashtag Microblogging NoFollow StumbleUpon 
Techipedia: Tamar Weinberg
DECEMBER 22, 2009
Tweet Spinner also has a “nofollow&# user list that will algorithmically never follow users who meet certain criteria. Moreover, you can also nofollow people based on their tweets. You might not want to follow specific users ever, and you can put their usernames into this box. Answers Yahoo!
Techipedia: Tamar Weinberg
DECEMBER 10, 2008
Abusing Twitter hashtags during a crisis. StumbleUpon Sending more than one story to your network daily. Submitting a story from another social news site to StumbleUpon for more visibility and eyeballs. This infraction goes for all social sites that accept submissions, and not just StumbleUpon.) Excess converts to spam.
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