Given the Twitter web interface is just an client of the Twitter semi-public API, I highly doubt this is it.

I love this theory, but at the same time, I feel that it's unlikely. Without knowing how their back-end is put together, that'd be like... trying to smuggle in a robot into an office building to break into a safe that's inside without knowing the floor plan, what kind of knobs are on the doors, etc.

Doubtful: It is well documented that Twitter has re-written many parts of the FE/BE framework, so I think it likely that their NIH attitude might be a benefit.