First, just go through these.. http://www.forbes.com/sites/kashmirhill/2014/06/28/facebook-manipulated-689003-users-emotions-for-science/ http://www.theguardian.com/technology/2014/jun/29/facebook-users-emotions-news-feeds -- എന്ന്, ഫെന്നെക് എന്ന കുറുക്കൻ.