Windows 10 telemetry secrets: Where, when, and why Microsoft collects your data
http://www.zdnet.com/article/windows-10-telemetry-secrets/
Good info there. Win 10 users with privacy concerns should change default setting from Full to Basic. Still doesn’t solve the issue completely, but helps. The most restrictive setting (security) can not easily be changed for home or pro users (only available in Enterprise and Education versions).