The Firesheep Firefox plugin makes it easy to hijack someone’s social network connections. For example, Facebook authenticates the client using cookies. If someone logs on using a public WiFi connection, the cookies are sniffable. Firesheep uses Wincap to capture the authentication information which allows you to hijack the connection.
Protect yourself by forcing the authentication through TLS or stop logging into Facebook using public networks.
It is realy scarey these days what people can do with technology. One just does not know all the risks they face when using social networks. It is really a shame our young teens post so much personal information about themselves on social networks. Great articles you have here on this site about personal safety.
David