Source: Too many to list
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.
Tag Spam means using irrelevant tags, especially popular tags. Using tags improperly makes it hard to find good and relevant content.
Please use relevant tags when posting! Abusing tags can potentially lead to people flagging you.
#photography
Please refrain from using #photography for posting art, posting graphics, posting other users photos without commentary, etc. @steemcleaners