Also in line: people promoting mobile banking app Refundo and Apple line regular Hazem Sayed, who is using his No. 1 spot to get publicity for his social media app Vibe.

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Number 5: Employees simply cannot be trusted and will likely say things in social networks that will become bad publicity for your company.

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The premise was simple: patrons got a free souvenir and the club got free publicity when photos of the glasses went on social networking sites.

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The FBI's publicity effort will include a website devoted to the Gardner Museum robbery and the use of social networks and advertising on digital billboards in the Philadelphia region.

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Publicity about the threat has made many users wary of clicking on strange-looking links posted via social networks, which may have prompted the perpetrators of this latest attack to switch tactics.

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