This isn't really a good solution for mobile phones which change IP address frequently.

Of course it isn't. But I can't imagine why the AP would want anyone to send tweets on their behalf from a mobile phone.

Maybe there isn't a single solution that meets the needs of every user.

>But I can't imagine why the AP would want anyone to send tweets on their behalf from a mobile phone.

Reporters in the field? Especially in a breaking news situation where they want to be first.

Are you suggesting that there may be many AP reporters who are authorized to tweet on AP's behalf from the field, implying a total lack of editorial control (and probably a total lack of coordination as well)? I think that is very unlikely. I'd find it very hard to believe that there isn't a very well defined system in place to control all official correspondence.

They have a news desk that is staffed 24hrs per day. Surely a person there could monitor tweets or communications from reporters in the field. I'd even expect there to be a different individual with the keys to the Twittermachine.