@LaterBot is a "save for later"-service baked directly into twitter
Reminder 2.0 is the best way to keep track of your reminders on iOS. Quickly add multiple reminders in a row using the return key. Set time and location alarms to make sure you don’t forget the important stuff. The interface was designed to fit right in with other first party apps. Reminder was built to be quick to launch and easy on your battery.