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 == Rollback question == 
 Hello. I have found your user-page because you are an administrator who grants rollback privileges. I am performing academic research and I am particularly focused on usage of the rollback feature. I have imported en-wiki dumps into MySQL for analysis, and flag RBs by parsing revision comments for the ""automatic comment"" left by RB edits.  

 My question: In February 2009 and the months preceding it, about 200k RBs were being performed a month. Beyond that, usage of the RB feature seems to decline sharply; in September 2009 I show only 1k RBs. Can you help me understand this? Did the automatic revision string change? Did the use of anti-vandalism bots (with their slightly altered RB strings (which I don't try to parse)) become so prevalent that no one does it 'manually' any more?  

 My current research has found no reason for this 200x change, and I hope you can help. Of course, your help will aid my research  which in turn will help the Wikipedia community in combating vandalism.   "