Megs--please note that the moderator added a credit to the picture below my original only after I asked why my link had been edited and after I questioned the inconsistency (i.e., that it's okay to swipe and post a photo from someone else's site but not to link to that site) in your policy, which is not published in the rules.
Yes, all sites work differently, but the ones that last are the ones that link to others and participate in what people who study the Web call a culture of generosity:
Micro Persuasion: Only Generous Bloggers Influence