Concrete job: fetch recent tweets from accounts you already follow. That’s it.

You follow Alice. She posts. Thunder keeps that post in memory for about two days — a live pile, newest first. No “is this good?” No model.

Marie, who follows Alice, opens For You. Home Mixer sends Thunder Marie’s follow list. Thunder answers with up to 1,200 posts (max 50 originals and 30 replies/reposts per person).

If Marie does not follow you, Thunder will never hand her your tweet. You are not in her pile. Discovery (Phoenix / SimClusters) has to find you instead.

Ads are not stored here. Thunder is only “what did the people I follow just post?”

More: Three doors.