Blaine Cook, Twitter's former chief architect, has a lot of time on his hands of late — and he's using it to complain about Twitter. On Twitter. His latest gripe: That his former colleagues are taking too long to restore a service that lets users submit updates via instant messenger. "It's not a difficult service to restore," harrumphs Cook. How much better if Cook had designed the system not to go down before he left, no?

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