Not citing the source of photos, or using copyrighted photos, is plagiarism. Here is a post on why this is bad, and here is how easy it is to find allowed photos.

Creative Commons: If you are reposting under a Creative Commons license, please attribute and link according to the specific license. If you are reposting under CC0 please consider noting that at the end of your post.

If you are actually the original author, please do reply to let us know!

Thank You! ☙

Also when sharing photos that are not taken by you, use #photo, or #photos for a tag. #photography is used for your own photos, discussion about photographers, or discussion about the techniques used in taking photos.