Firesheep

American people are “borrowing” their neighbor’s Wi-Fi connection without any permission and asking. According to a new national survey about 32% of the polled say they mooch a neighbor's unencrypted Wi-Fi connection. That's nearly double the 18% who said they borrowed Wi-Fi in a 2008 poll.

"The reality is that many consumers have not taken the steps to protect themselves," said Kelly Davis-Felner, marketing director at the Wi-Fi Alliance, a non-profit trade group that commissioned the surveys.

A developer Eric Butler showed critical vulnerabilities in most social networking and other websites that allows anyone collect private user data including login credentials from Wi-Fi networks. Butler has created Firefox extension, Firesheep, which will let you essentially eavesdrop on any open Wi-Fi network and capture users’ cookies.