Should Journalists Have to Ask for Permission to Use Photographs

Should journalists have to ask for permission to use photographs or videos they find online when they use them for news purposes, and if they do use them without permission, what kind of attribution or credit should be given? Consider this question from the perspective of a journalist who is trying to deliver news to the audience. Also, consider it from the perspective of a journalist who has taken the photos or the videos that others may be using for news purposes. Finally, consider it from the perspective of a person who may have posted that photo or video on a social media site without intending it to be used for news purposes.