Just spotted little green blobs next to posters' names. Hover mouse and "xxx is on a distinguished road". Mine just says my name. Dig further and I believe this is "reputation". But I can't find anything about reputation in the FAQ.
So my question is "how is reputation established?" I see newbies appear to get the "on a distinguished road" rep as do people I consider to be very helpful/knowledgeable. But I'm a boring grey - presumably with a worse rep than a newbie, though I'm not aware I've wound anyone up.