We don't like to see images that are posted on our main site, and/or The Message Board posted elsewhere without photographer/provider credit, so we've found the best way to discourage it is to put a few 3W's in the background - some obvious, and some not so obvious.
We try our best to only post images here where the image was provided to us by the photographer, or by the person who holds the original. That way, we're not posting images that already appear elsewhere online, and, where nobody has made an attempt to identify the actual photographer or the person that actually holds the original.
There's always been very little effort to identify photographers or photo owners on most online sites/social media pages... and now it's even gotten worse. It's even gotten to the point now where folks will lift images that have been embedded with photographer/collector/owner imformation, and will intentially crop the image really closely so that it appears to be an uncredited photo, so that they can then post it on their site as an original image.
Not sure why they don't just post the link to where the image already appears elsewhere?
Here's what you see a lot of now:
We'll post an image like this:
Sure enough... somebody with a Facebook page or other online site will lift the image, crop it, and will post it elsewhere like this (without any photographer/provider or site credit):
...Which is why we mark up the photos a lot more than we'd like to (see same image below), and also add a few stealth "3W"s in there so that folks might be encouraged to "link" instead of "lift."