Twitter bought Sphere, a group-chat app for strangers, and shut it down

A group-chat app connecting strangers interested in the same topics.

That group chats between strangers around shared interests — not already-connected friends — unlock healthier conversation than today's social platforms

Sphere was founded by Nick D'Aloisio — who sold the summarization app Summly to Yahoo for $30m at age 17 — and Tomas Halgas. It began as a question-and-answer app letting users instantly chat with paid experts.

By the end of 2018 almost 500,000 people were using the Q&A version, but D'Aloisio noticed people talking throughout the day with strangers — 'not just talking to their friend on Facebook, but someone they had not met before about something they were interested in' — and the app pivoted toward group chats, with multiple chats per group, highlighted announcements, and notifications targeted at individuals or unread members. D'Aloisio cited toxicity on Reddit, Facebook, Twitch and Twitter as the problem worth solving.

Sold to Twitter for an undisclosed amount in October 2021; Sphere closes in November 2021 and its roughly 20 staff join Twitter to integrate its community features into the social network.

It is a founder's second build-and-sell: D'Aloisio sold Summly to Yahoo at 17, and Sphere shows the same pattern of small team, sharp pivot, fast exit.

The pivot came from watching real usage — half a million Q&A users, but the durable behavior was strangers talking about shared interests all day.

Twitter bought the would-be solvers of its best-documented problem, toxicity, while shipping its own reply prompts and safety mode in parallel.

When the asset is a team's understanding of a problem rather than its user base, the natural exit is an acquihire: the app closes and the insight moves inside the buyer.

Sphere shut down in November 2021, with its roughly 20-person team integrating community features into Twitter. The sale price was not disclosed, and the app's independent product — like its paid-expert predecessor — ceased to exist as a consumer service.