Fake Twitter Followers?

Almost all suppliers sell fake twitter followers.
Fake accounts, with pictures, description and many followers.

I know you can buy mass numbers of accounts with pics and the 'About You' part filled in.
But how do some sellers post tweets from all these thousands of accounts automatically?
And how do websites such as twitter - future .com send the fake followers within 5 mins of paying?

Which program // bot is used?

try tweetattack, you can have it follow your vip list

Tweetattacks, Tweetattacks, Tweetattacks - Nothing else even comes close.