Entre las mas importantes y dependiendo de la aplicacion.
http://www.facebook.com/
http://www.twitter.com/
http://www.hi5.com/
http://www.linkedin.com/
Cada una con sus ventajas y desventajas.
Sophos Australia Facebook ID probe 2009
Just over two years ago, Sophos UK conducted a Facebook ID Probe to see how willingly social networkers give out their personal data. 43% of those in the probe accepted an invitation to be friends with Freddi Staur – allegedly a 20-something from London, but in reality a green plastic frog.
http://www.sophos.com/blogs/duck/g/2009/12/06/facebook-id-probe-2009/
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