"Nearly every second, a user on Twitter tweets about what time it is." Chirpclock makes use of this as an interesting way of keeping track of the time.
Nat Morris built a machine that gives his dog a treat and takes photos when people tweet to @FeedToby. [more inside]
Self-Organized, Hyper-Networked Revolts—Coming to a City Near You: Wired looks at how messaging and social media have influenced the dynamics of riots, protests, other large crowd gatherings.