What is the purpose of a fake Facebook profile?

Why some people create false FB profiles and try adding new friends ?
Does this behaviour bring visitors to their website ?

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It puzzles me, too. When someone fakes in one place (Facebook) it seems to me they would fake in another (their website). It may bring new visitors, but not link clickers and certainly not return visitors.

Its called spamming and facebook may ban them soon…Also as Shyflower told its of no use as it is unable to bring quality visitors…