For a large number of Twitter accounts we track their statistics for followers and tweets on a daily basis, and the changes can be viewed on this page. For the daily statistics we show the last 30 days, while monthly statistics are available if and when daily tracking has crossed a month end.
Anyone can request for daily statistics to be tracked for their own account. To request tracking of your statistics you need to be logged in. Once the request has been registered you do not need to be logged in to be able to view the statistics.
All tracked daily statistics are viewable by anyone.