About Jeff. On Twitter: @JeffMiller
Punchfork. A discovery engine for recipes, powered by social data. Acquired by Pinterest.
Freebird. Twitter for busy people. Freebird filters your Twitter stream and emails it to you daily.
Hacker News Twitter Feeds. Tweeting Hacker News stories as soon as they reach 20, 50, 100, 150, 300 or 500 points.