You'd like/comment/otherwise interact with posts/channels on Twitter, Telegram, and maybe some other places (you could also open Lightning channels, I think) for bounties. So you could like a twitter post for 20 sats, or comment on one with a specific word for 50, etc. But eventually, the tasks dropped to like 5 sats for comments and retweets, and half were to dead Tweets anyway. I only really found it late last year, so I missed it in its heyday.