What are some alternatives?
Listomatic - Automatically create and manage Twitter lists
Toucan - Toucan is a small portableapp utility allowing you to synchronise, backup and secure your data with...
News Feed Snooze - Hide a person, Page or group for 30 days on Facebook
Notify by Facebook - Notifications that matter from sources you love
HitLyst - Use Twitter lists like a pro
Jona - A curated searchable database of 11,000+ startup journalists