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Reddit: growth curves, a growth sort, and much deeper discovery

Re-checking a Reddit post now records what it had before, so every card can draw how it grew. You can sort and filter by measured growth instead of raw score.

Until now a Reddit post was a snapshot: whatever it had the moment we saw it. If we ran into it again four hours later we skipped it, because we already had it. That threw away the single most useful thing about a trending post, which is whether it is still climbing.

Now every re-check updates the numbers and records a measurement. Cards draw a small chart of their real history, hovering a point shows the value, the gain since the previous point and when it was taken, and two new controls use it: a Fastest growing sort, and a minimum growth filter that asks "did this climb?" rather than "is this big?"

While building this we found that the table meant to store these measurements had been quietly broken since June and had never held a single row, for any network. It has been rebuilt, with a self-test so it cannot fail silently again.

Deeper discovery

The browser extension gained a Reddit module that captures the logged-out front page, walks several listings at once, and reads Reddit's own directory of popular communities. Subreddits nobody added by hand now start producing posts on their own.

The date filter also takes any number of days now, not just the fixed 24 hours, week or month. The interesting window for a Reddit post is usually somewhere in between.

Try it in the app β†’