I have experienced sending search requests out which return a plain string, rather than JSON representing a twitter error. It's this:
"You have been rate limited. Enhance your calm." a) What is the rate limiting based on, IP or client? What is the limit? I develop a Twitter library (tweetsharp) and by default I send the tweet# credentials along with the call. If this means that anyone using my library will be rate limited because of that header information, I need to know so I can force my users to provide their own credentials so that the library isn't unusable in this area, and b) Can we get his as XML, JSON and not a plain string?
