>Those two public gathering photos seem utterly indistinguishable to me. The difference is that the first two public gatherings show a historical landmark (the

>Those two public gathering photos seem utterly indistinguishable to me. The difference is that the first two public gatherings show a historical landmark (the Brandenburg Gate) and a political protest. The last photo is just a few people gathering. In practice the difference is usually pretty clear. If there's something of public interest in the photo it's fine, but you can't just take a snapshot of a bunch of people having a picnic in a park or just sitting on the subway without consent.