“Real-time interactions happen as they happen. Timely ones, on the other hand, happen as you need them to happen. Some real-time interactions, like breaking news about an earthquake, can be timely. But not all timely interactions are real-time. I’d argue that most are not. And where the Fast Web is built around real-timedness, the Slow Web is built around timeliness.” (Via Paul Kedrosky)
Some additional thoughts: First, this is why I’ve largely abandoned Twitter; it’s not “timely” in the sense described above. Second, this line of thought intersects with Nicholas Carr’s musing on “realtime” in his “realtime chronicles” series of blog posts (google it if interested). Finally, I should think about trying one or more of these services out; I’ve started with Budge, because I do need someone reminding me to floss.