Feed Monsters is designed to allow you to edit RSS feeds on the fly in order to allow you to maximize your social media presence or just automate some blogging and tweeting tasks.
Feeds can be filtered, posts can be delayed, words can be changed, and new features are being added based on user feedback.
Each RSS feed that you want to modify gets a monster created to work on that RSS feed. You then add a variety of parts to the monster to get the exact look and feel of the RSS feed that you want.
Create an account, and take a look for free for 10 days. If you like it, subscribe to the service for just $20 (USD) a year.