How Many People Use Twitter's Own Apps?

> the results that I collected are from a random sampling of tweets across a 9-hour period, approximately 9am to 5.30pm on the 18th July.

9am to 5.30pm in which time zone? That could greatly skew the data. A better study would be time period that is a multiple of 24 hours.

Day of the week matters, too. People might tweet from the work computers on weekdays and then tweet from the phones on the weekends.

I'm hoping that twitter bans 3rd party clients sooner than later. This, hopefully, will create enough buzz and momentum for us to move elsewhere.