Klout: I am now a Specialist.

My latest Klout.com analysis has listed me as a “Specialist”, which is new for me. For years (or at least, the start of Klout), I’ve been listed as an Explorer, one who “gets it and will soon be moving up.”
The one person in my network that has ever been listed (to my visibility) as a Specialist is Ed Palumbo (@DotEd). I am now one of two in my visible network, yet there is no change to my Klout score at all.
How does Klout score? Why was my classification changed?
What have I been doing differently?