Feature designed to connect you to existing contacts vulnerable to abuse.
Hackers said to be able to hijack web sessions and read emails.
Hackers are targeting users of digital video game store Steam.
Treasure Map programme described as ‘Google Earth for the internet’.
As part of efforts to imporve Google+
The feature was spotted in Facebook app for iOS.
New services also promise end-to-end content protection.
New technology's reliance on the old is a security weakness.
5 million email addresses and passwords likely old credentials.