There's a lot of infographics that have been shared here. I'm thinking if stealing of infographics with or without a source is considered as plagiarism?
Of course it is also part of plagiarism. Members most of the time get away with it because the no nonsence anti-plagiat bot can't detect this kind of plagiarism and also you can find lots of copies of images floating on the internet so it's sometimes hard to pinpoint the source of the image