If you are leaving something on a server for someone else to pick up then that information will be saved and logged. That information might be deleted eventual

If you are leaving something on a server for someone else to pick up then that information will be saved and logged. That information might be deleted eventually if they are not asked to do otherwise. Wasn't Facebook at one point bragging about their data-mining efforts on "unposted" wall-posts? What I notice most in this article is that it mentions NSA and not GCHQ but the article says that the investigation started from the UK's SOCA.