How our dumb bot attracted 1 million users without even trying

GUEST: Three months ago, we released a modest chatbot that we thought could be fun to use in group conversations. The bot, which we called Roll, did one simple thing: It randomly selected a participant in the conversation as the answer to such pressing questions as “Who is the biggest flirt?” and “Who’s calling the Uber?” and “Who has a crush on me?” (The answer to all of the above is you, obviously.)
We did nothing to promote the bot. No ads.