A new site called Thunderclap can do for your messages on Twitter what Kickstarter does for burgeoning ideas. Get enough people to support your message through the Thunderclap website and they’ll all tweet it out at once, perhaps increasing the possibility that your message could become a trending topic on Twitter.
A message will be Thunderclapped if it gets a certain number of supporters by a certain date in time, determined when you create the message. The default setting is 500 supporters within seven days. Once the goal is reached, the message will be automatically re-tweeted by every person who supported your message by clicking the “Back this Message” button.
For more see: http://mashable.com/2012/05/31/thunderclap/