I'm looking through the FAQ for the tweet button and am not seeing one of the attributes listed. On the page, the different examples have an underscore and equal and a 13 digit number (e.g. http://twitter.com/share?_=1306165040196 ). It looks like the first 10 digits could be a unix timestamp, but I'm not 100% sure about that. It also means the three digits at the end (196) are something else. I couldn't find anything in FAQ, so I'm hoping someone can help. What is this number? Thanks. Tony
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