Hi, You’re absolutely right. Proper crediting is important, but often not easy since a lot of what I find was credit-less in the first place.
Another part of the reason why many of my posts are disconnected from their original is that I usually don’t post them at the same time I collect them, so they are just files on my hard disk.
Depending on how much time I have, I actually try to find the original source (mostly via reverse Google Image Search or Tineye) of what I post. In other cases, you can often find the creator of an image by going through my archive and looking for a similar image with a source.