Apparently it's NOT that simple as people are finding this happening with other programs as well such as You Tube. You should read that other thread that was referred to in the top of this page (page 2)

Thread: Google is spying on your with your Android phone (Page 2)

Unless you are advocating that we stop using computers, phone and anything else that might have a mic (or camera for that matter in it) such as TVs, maybe Xboxes...maybe other household appliances...it's NOT as simple as not using Facebook. Although of course....people SHOULD stop using FB, IMO. The basic problem, of course, is not that we are using ANY programs, but that our government/corporate/media MIC should NOT BE SPYING ON US!