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I'm going back to where you said your intent is to be a leader in this space. If you want to be a leader, you need to come up with a new angle on the content itself and have a reason for people to come to your site as a direct visit or rss subscription, not coming there because they found you in a google search for a trending topic. Mashable, and sites like them, gets their views and is a leader in their field because they are the ones who went to YouTube and sorted through hundreds of videos to find those ten videos, write descriptions about them, select the order that they appeared, etc. If you truly want to be a leader, you'll need to be the one out there doing that, not rewriting copy after another site does the research. It's less about "does this beat a plagiarism detector and can I stay a step ahead of the Google algorithm" than "can I provide some awesome content or way of looking at things that no one else has done yet".