Google has bought out London-based fraud prevention startup Spider.io in an effort to protect its advertising business model from ad-clicking malware spread by botnets.
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Yahoo has confirmed that their ads on European websites were subject to a malware injection attack from Dec 31 to Jan 3.
A class action suit out of California has Facebook defending allegations of data mining their users' private messages. Defendants claim Facebook records links in PMs and shares the data with advertisers.
Twitter has bought local discovery app Spindle. Spindle, available on iOS in the U.S., describes itself as a "news feed for your neighborhood", collating Twitter and Facebook posts from local businesses into a stream of local events and offers.