| http://www.w3.org/ns/prov#value | - Twitter???s will now open up their advertising platform to small businesses, giving them:Set bids for promoted accounts on a cost-per-follower basisSet bids for promoted tweets on a cost-per-engagement basis, meaning they pay only when users actively engage with the tweet, for example by retweeting, replying or marking a tweet as a favourite.Dick Costolo, Twitter???s CEO, gave a clear example of w
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