I actually talk quite a bit about wifi and security (and even in connection with Facebook) in the class I’m teaching this week (it falls under the “how to keep your private life… private” section…)
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If you use facebook, make sure you change the security settings. The default behavior is over http and this Wi-Fi sniffing app (facesniff) for Android is gaining a lot of traction. It builds a quick ‘hit-list’ of usernames/passwords it has gathered as folks login with their mobile phones or other devices over wi-fi. Then it builds a hyperlink style list for someone to login to your account instantly after it is captured.
http://gunsjy.blogspot.com/2011/06/faceniff-apk-for-android.html
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