If the original link and source is given, it can not be plagiarism, by any stretch of imagination.
However, if the group policy is not to paste entire articles, I will be happy to abide by that.
Correct, it's only plagiarism if you claim you have written it yourself and you dont state the source.
Otherwise quoting would be plagiarism too, and knowledge would not be shared very efficiently. (Most people hear about new things via third parties rather than the person who originally came up with the idea).