Well, there goes any linking to spacecraft trackers, since if they list the ISS they fall foul of this rule. Or to Nasa's homepage, since they often include the

Well, there goes any linking to spacecraft trackers, since if they list the ISS they fall foul of this rule. Or to Nasa's homepage, since they often include the location of currently active crewed spacecraft. Probably can't link to SpaceX either, especially if they're running a crew up to the ISS. Or the plans/sightings of senators who escape to Cancun. Or "I met celebrity X on this flight and they were really awesome!" posts. Or...