They're doing it again (Twitter account required). If you don't have a Twitter account, it's worth it not just for this offer but also to search for "#freebies" from time to time.
At Amazon Instant Video, watch over 100,000 movies and TV shows, online or on your TV. Use your $5 credit to rent a new release movie, catch up on recent TV seasons, or even watch your favorite TV shows the day after they air.
Click the button and you will:
Connect your Amazon.com and Twitter accounts. (If you are not already signed in, you will be prompted to do so).
Automatically follow @amazonvideo and @amazon_movies. The message "I just got a $5 credit for instant movies and TV shows @amazonvideo. Click http://amzn.to/oXQePf to get yours. #get5" will be automatically tweeted from your Twitter account.
After you allow the app, you'll see:
This application will be able to:
•Read Tweets from your timeline.
•See who you follow, and follow new people.
•Update your profile.
•Post Tweets for you.
You can delete the app later. *hint*hint*
We have successfully applied a $5 credit to your Amazon.com account, good for movies and TV shows at Amazon Instant Video