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Amazon lets fans add items to their basket through Twitter.

Vikas Bysani

Taco Bell is offering a comic book on its Tumblr channel, titled “The Spicy Adventure of Johnny DLT”. Selfridges, the UK department store, is using Google Plus as a part of its biggest-ever beauty-ad campaign. YouTube has made it possible for channel owners to add a three-second intro to their videos and Twitter now allows advertisers to target promoted tweets and promoted accounts in 20 different languages. Find out more by giving the podcast a listen.