Interactwive makes Twitter contests and competitions easy for everyone concerned. People can enter by @mentioning your Twitter account in a tweet. You can optionally limit entries to those who also tweet a link, word, or #hashtag.
An example entry tweet: Use Interactwive to run Twitter competitions: http://interactwive.com - via @tbbuck
Getting started takes no time: register, and then enter how long you want your competition to run, what people should tweet to enter, and we'll start collecting tweets straight away!
See who's entering your competition, live and in real-time.
You can download people's entries at random - great for selecting winners!
We at Interactwive want to make life easy for you - by taking away the hours of work and pain of doing this yourself.