I read somewhere that Google is tracking machine ID when images are uploaded to Google+ profiles. might explain why they make it difficult to add images from online sources and require upload from computer. Can anyone comment on this? Do they capture machine ID? Is there a method to mask that? We don't want total anonymity, we actually want session ID's to be tracked between google, fb and other accounts as our VA's develop personas. But we need to keep Google Identities completely clean from each other. I've read about the MAC address tracking but not sure it is the same thing. would a MAC address spoofing tool block (or mask) data attached to image uploads? Thanks for ideas and referrals.