The American Chemical Society Tweetup at the Expo was held at Booth #236 at 4PM on Monday August 23, 2010 at the Boston Convention & Exposition Center in South Boston. This event lasted almost an hour and was well attended considering that it was held during expo hours and the technical sessions. Discussion topics included current use of social media, recent improvements to the ACS Network and the extremely active Twitterfeed and Twitter Cloud using the #acs_Boston hashtag. Participants in this event included ungergrads, exhibitors, attendees, ACS Employees, ACS Committee Members and media. This ACS National Meeting Boston Tweetup is considered to be the first Tweetup for the ACS Community.