My personal suggestions would be:
Andart (Anders Sandberg)
Ben Kuhn
Center for Applied Rationality
Effective altruism
Everyday utilitarian (Peter Hurford)
Jeff Kaufman
Ideas et cetera (Spencer Greenberg)
Information processing (Steve Hsu)
MIRI
Meteuphoric (Katja Grace)
Overcoming bias (Robin Hanson)
Philosophy, et cetera (Richard Yetter Chappell)
Rational altruist (Paul Christiano)
Reflective disequilibrium (Carl Shulman)
Robert Wiblin
The GiveWell Blog
My personal suggestions would be:
Andart (Anders Sandberg)
Ben Kuhn
Center for Applied Rationality
Effective altruism
Everyday utilitarian (Peter Hurford)
Jeff Kaufman
Ideas et cetera (Spencer Greenberg)
Information processing (Steve Hsu)
MIRI
Meteuphoric (Katja Grace)
Overcoming bias (Robin Hanson)
Philosophy, et cetera (Richard Yetter Chappell)
Rational altruist (Paul Christiano)
Reflective disequilibrium (Carl Shulman)
Robert Wiblin
The GiveWell Blog