Finding people
Whoshouldifollow.com answers that simple question. Given your username, it will look for other users with some overlap with the people you follow, and suggest them as people for you to follow. Add some of the names there and then repeat the process, and you'll quickly build up a large network.
In Britain, the prime minister's office decides people should be able to find out what their premier is doing; as of today, more than 2,000 people do. During an interview at the SXSW festival in March, audience dissatisfaction with Sarah Lacy's interviewing style with Facebook founder Mark Zuckerberg spills over into silent but powerful discourse among the audience: one calls it a "train wreck". People fleeing from fires in California say where they are; that proves more useful and timely than official goverment information.
