Are social networking sites vulnerable?

I am scared and genuinely concerned after reading a top story on Yahoo titled, "How hackers find you".

The story's summary is that hackers find you mainly through the information we give at social networking sites like MySpace, FaceBook etc. etc.

While very professional networking people whose real interest in the social networking sites is to network, amateurs like me, linger there only to satisfy the vanity that I too am a member of all the popular social networks.

Sometimes, I oblige a friend who invites me to join a new website like Twitter.

The Yahoo story leads to a video that I could not understand. Please post here what you can deduce from it. Please mind that I am a heavy user of social networking sites to attract blog traffic.

So, hackers too wait patiently at My Space(smile) to attack my system.

Is it so?

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