I have a bunch of twitter accounts with followers that range from 500 - 10000. I monetized these accounts and make around $5 - $10 a day just sending a few tweets out (takes mins to do). You set your price based on # of followers ( i have 1 account set at $1.25 per tweet) The sites sends sponsors to you and you pick what you want to send - i send almost everything - lol
If you have a Twitter account and want to check it out - go to :
Sponsored Tweets
Enjoy