Some is even more ridiculous as following
So many fakes. An image and even a video can be easily altered/staged, to create online outrage.
There were some videos of masked men in some cellar with dim lighting saying they will commit war crimes or similar. Could have been filmed in any place of the world.
Or shaky videos of acts that seemed like a war crime with certain arm tapes and uniforms. Similarly could have taken uniforms from fallen soldiers and staged a video to discredit the opposite side.
Take all examples posted here with a grain of salt. 
But some have a mountain of evidence from many sources, which is not possible to fake: