Since I'm researching the most influential Second Life blog sites for an upcoming project, I just hit HyperGrid's post about that topic, which in turn sent me searching on SimilarWeb, and to a corollary query: What's the most popular, third party site for Second Life opinion? There I'd say it's not a blog but a messaging board - SL Universe.
According to SimilarWeb, SL Universe gets monthly visits in the low six figures, and that's no surprise. Founded by longtime SLer Cristiano Midnight (who I met in SL way back in my Linden days), it's become so influential even ex-Linden CEO Rod Humble used to get involved there.
That's mostly why SL Universe is so popular with SLers, though according to SimilarWeb, there's another reason: