Hi
I previously developed a facebook group joiner for an old client of mine. I have written many facebook bots that do many different things such as auto liking statuses, pictures, wall posts, scraping, etc. I am 7 years of experience with software development and I am currently rated the number one bot developer on Elance. I have written my own facebook api therefore I can build your bot within a day or two maximum. I know facebooks security like the back of my hand, but you must understand that you can only join x amount of groups before your account will get banned. Your program will be developed for windows systems using .net framework and will be completely multi-threaded so it will be very fast and stable.