One of the biggest problems with the so-called Web 2.0 movement has been its encouragement of oversharing — which often means underestimating security risks. Adding doodads of varying quality to a home page can add a lot of pizazz, but can also be fraught with danger, since they can open a door for hackers. It’s a threat even for the biggest Web companies, including Google, whose “gadgets” are increasingly juicy targets for hackers, two security researchers said Wednesday.

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