When Sachin Tendulkar retiredfrom International Cricket the Board of Control for Cricket in India (BCCI) conducted a memorable social media campaign. Sachin's personalized digital autograph was sent to fans who use twitter and participate BCCI's twitter campaign for Sachin. To get Sachin's personalized digital autograph you had to send a tweet with hash tag #ThankYouSachin mentioning @BCCI in your tweet. Read more: http://www.angraj.in/2013/11/tweet-and-get-sachin-tendulkars-digital-autograph.html#ixzz3UOCCuuEQ