Privacy & Licensing issues with google+, fwiw, compare the posted Google+ terms of service with facebooks terms;
"For content that is covered by intellectual property rights, like photos and videos ("IP content"), you specifically give us the following permission, subject to your privacy and application settings: you grant us a non-exclusive, transferable, sub-licensable, royalty-free, worldwide license to use any IP content that you post on or in connection with Facebook ("IP License"). This IP License ends when you delete your IP content or your account unless your content has been shared with others, and they have not deleted it."
"The state librarian of Kansas, with the backing of state attorney general's office, is planning to terminate the Kansas Digital Library Consortium's contract with ebook vendor OverDrive and is asserting the bold argument that the consortium has purchased, not licensed, its ebook content from OverDrive and, therefore, has the right to transfer the content to a new service provider."