Spaced Repetition for Twitter combines Twitter with the benefits of Spaced Repetition. If you like a Tweet, it will be delivered straight to your timeline in increasing intervals, thus massively improving the long-term value you get out of Twitter.

Tweroid combines the concept of Spaced Repetition with your Twitter timeline.

It captures your liked tweets and delivers them in spaced repetition manner to your timeline. You can also import quotes from books you read to supplement what you remember.