The document describes a 24-hour experiment on Twitter called SmackMyTweetUp. The experiment involved sending out an initial tweet and then letting it spread organically through retweets and retweets of retweets over the course of 48 hours. By the end, over 350 messages were sent, 1,500 visitors came to the site, and 5,800 clicks were generated, all without any promotion other than word-of-mouth spreading on Twitter. The summary concludes by encouraging people to get on Twitter to continue spreading the word.