Anyone who has been asked by a friend or family member to fix a slow PC understands the average home user will happily click any link, accept any friend invitation, and even install software from just about any Web site.

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"Very often I get an invitation from a friend for a game and I'll click it and see the permissions, and decide, I'm not really that curious about this app, " she said.

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He closed the first session of the TEDGlobal conference with an invitation to everyone to become his friend on Facebook.

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Tournament leader McDonald needed the intervention of good friend Nick Price to persuade the tournament organisers to give him an invitation to the event.

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After Madoff made the invitation a second time, Wilpon happened to have lunch with an old friend named Howard Squadron.

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Introduced to Hefner by a friend, Madison was a 22-year-old Hooters waitress and college dropout when she got her first invitation to go clubbing with the Playboy mogul and several Playmates.

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