Though this blog post has been copied several times most photographers link back to the original.
Linking or giving credit doesn’t really matter in terms of copyright infringement, unless rights are given to copy if a link is provided. Copying is copying. The only time it’s technically legal is when it fits into Fair Use, such as commentary (e.g. a rebuttal), newsworthiness, etc.
So, yeah, that photographer did plagiarize that blog. The new question is “Does it matter?”
The blog owner is unlikely to care, and he is the only one that matters.
I generally wrap my blog posts with creative commons or gnu free documentation license. Note that CC licenses require credit… it’s not optional, either you credit it, or you are violating copyright.
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