Well, I guess so, but we are all here to share some information right? What if they layout the topic and make some summarize about it, should we still consider it as a plagiarism?
Then you source the info, and if it's not a complete rip off of someone's else content, it's not plagiarism. Simple.
But please don't tell me doing a complete Ctrl C + Ctrl V of someones else post or website and posting here as your own isn't plagiarism. Because that's the only thing that gets people banned.