And they suck at advertising, and they suck at web services. Why go in deeper? The thing Twitter has that could be of value is a big library of users with acco

And they suck at advertising, and they suck at web services. Why go in deeper? The thing Twitter has that could be of value is a big library of users with accounts, but Apple already has that. iTunes accounts are (I think) roughly the same size as Twitter, plus all accounts have some payment mechanism on file.