1. Amazon debuts cloud music service
    Google also testing streaming music feature
  2. Facebook testing chat ads
    Meanwhile, advertisers giving up on Myspace
  3. More media mergers likely?
    Investors warn of social media bubble
  4. Google + MasterCard = mobile payments
    One of many trying to merge credit cards and phones
  5. Reporter sued for writing about Righthaven
    Copyright trolls suing Ars Technica freelancer for using court docs
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