What is the legality regarding reposting other people's articles on your own blog/site? I'm assuming it's illegal to straight up copy someone's full article without giving credit, but what if it's only an excerpt, say 1 or 2 paragraphs, and then a link to the original article? Is that okay? Is that legal? And what about pictures? Can you use someone else's picture as long as you host it on your own server?