On the second preview day of the 13th International Architecture Exhibition, the jetlag is fading, navigating the Giardini is becoming old hat, and there are all sorts of happenings at the U.S. Pavilion and around the entire biennale. Here are a few reactions from the twittersphere to the exhibitions on display, a sighting or two around town (both of people and of ARCHITECT magazine), and even signs of a spontaneous intervention cropping up on the streets of Venice.