It's also possible that PostPost could miss someone who's important to you. Its process for determining who's most relevant to you is automated, and it's completely conceivable that you may value someone more than the service's algorithm realizes. You can't manually add someone to its list; it would be nice if you could customize its display, as Facebook lets you do with its timeline feature. But the folks at PostPost say their service is meant to be used as a complement to Twitter, not as a client that replaces the service itself. And when used together, Twitter and PostPost will make sure you have all of your bases covered.