My scheme is to not worry about copyright on posted images. I'm not too concerned if someone that isn't making money on the image uses something I post. If an image I post gets picked up and goes viral (LOL), then someone will find me.
If the use of the infringed image doesn't make much money, going after the infringer would also not make much money.
If the use of the infringed image makes a pile of cash, then the copyright attorney's will be lined up to take my case.
Think the idea of having the name or website in a corner is fine, but watermarks across an image are just non-photographic.