http://www.seomoz.org/blog/how-to-win-tweets-and-influence-search-engines-with-paywithatweet http://www.seomoz.org/blog/how-to-win-tweets-and-influence-s... 60

http://www.seomoz.org/blog/how-to-win-tweets-and-influence-search-engines-with-paywithatweet http://www.seomoz.org/blog/how-to-win-tweets-and-influence-s... 600 some tweets, still going. Works good in certain verticals - works really good in web analytics/online marketing.