Custom feed is the new name for a multireddit. Find out more from the custom feed announcement post. They used to be called multireddits. They're basically a collection of subs where you can have a custom front page-type thing with all of them included.
The 31 biggest subreddits - most subscribed to Subreddit?AskReddit — 19,510,110.todayilearned — 18,981,496.worldnews — 18,977,231.Science... more