"Windows 10 Shares Your Wi-Fi With Contacts"
krebsonsecurity.com/2015/07/… "This brilliant new feature, which Microsoft has dubbed Wi-Fi Sense, doesn’t share your WiFi network password per se — it shares an encrypted version of that password. But it does allow anyone in your Skype or Outlook or Hotmail contacts lists to waltz onto your Wi-Fi network " OOOOhh this is your big security flaw :-) so turn it off