chris brogan offers another "not dead yet" perspective on google plus.
he makes some good points, including this closer:
Don’t reply with “no one’s there.” You don’t buy a fridge and find it full of food. Millions and millions of people are there. You’re just not doing the work. If 500 million have an account and reports estimate about 250 million people are fairly darned active, that’s more people than Twitter. You’re just not following them yet.