My favorite filter for Paleo studies is Melissa McEwen http://huntgatherlove.com but also in Twitter and Google Shared links forms. I'm not much of a science nerd so the fact that she offers nuance and discerns interesting topics covering a breadth from anthropology, agriculture, and nutrition is key for me. Plus she's opinionated and a great writer. I don't care for marketing testimonials and unless it's your life's work there's too much out there in studies without picking some good guides in my opinion.
Other interesting sources for paleo studies or testimonials: Robb Wolf, Denise Minger, Kurt Harris, Gnolls, Jack Kruse, R Nikoley, Evolvify, PaleoHacks, Healthy Skeptic / Chris Kresser, Perfect Health Diet, Guyenet, Masterjohn, Mark Sisson.
Some of the above I follow the sites of, some just on twitter, some no longer but have gotten use out of in the past.
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