I came across an article in a mag this week with a bit of info that may be useful to people on this board who are twittering from there Arduino's or other systems.
Twitter will only allow up to 100 messages an hour, any more and they are dropped.
They match this against the user account and ip of the sender.
Im not sure how this is handled, if you get to 100 it then refuses the rest till the remainder of the hour expires maybe?
So if you have more than 100 messages an hour from one ore more devices on your local network goinmg through the same router to the internet you are going to get what seems to be an intermitent loss of tweets.
Its something to think about when debugging and testing.
Gordon