I had the chance to test the @dorabot in the first stages of its developement and use it in 2 of my contests.
FUNNY CONTEST #1 and FUNNY CONTEST #2

In fact i made these "funny" contests to test the functionality of the @dorabot, in order to be sure that i can use it in future contests that require a random winner to be picked. @danielsaori was very helpful during the process to pick the winners and i want to thank him for that.

The ?winner command that picks randomly a winner from the voters list (post or comment) and can be executed directly in the comments section of a post, is something that was missing from the steemit platform. I had see many contests in steemit that was picking a random winner with the use of third party services.
With the use of dorabot its very easy for everyone to think and create contest posts and then pick the winners randomly. And having the "randomly" defined in this post, is crystal clear how the @dorabot picks the winner.

Thanks to @danielsaori for his effort to create this tool and for making it available to everyone for free.