On August 23, 2007, when Twitter user Chris Messina tweeted a suggestion to use the # symbol to group conversations on the micro-tweeting platform, hashtags were born.
People holding mobile phones are silhouetted against a backdrop projected with the Twitter logo in this illustration picture taken September 27, 2013.(photo credit: REUTERS/KACPER PEMPEL)ByMAAYAN JAFFE-HOFFMAN
