"Google Inc. has been vacuuming up fragments of people's online activities broadcast over public Wi-Fi networks for the past four years, a breach of Web etiquette likely to raise more privacy worries about the Internet search leader."
Leadership at Google says it has ceased the practice and is notifying regulators,
"Nevertheless, Google's decision to hold on to the Wi-Fi data until it hears back from regulators shows the company realizes it could face legal repercussions. At the very least, company officials concede that snooping on Wi-Fi networks, however inadvertent, crossed an ethical line. "We are acutely aware that we failed badly here," Eustace wrote.
Antoerh good reason to secure your local WiFi. Google might be looking over your shoulder.