Knowing when to post content to the Web can feel like a black art. It's always procrastination time somewhere. But understanding one's audience can yield simple and scientific insights about the best times to reach it. Balancing work and scheduling is still a lot of work, though, so Web services have cropped up to handle that effort algorithmically, letting publishers concentrate on publishing. Buffer, a service that stacks up one's tweets and publishes them at the best times for engagement, has analyzed its user data and found some promising results. Buffer's developers report that clicks on tweeted links increased by 200% on average after two weeks of using the scheduling app, and retweets doubled.