The London-based start-up said it will no longer accept new groups and will wind down its app next month. Twitter buys group chat app Sphere. | Photo Credit: Reuters The London-based start-up said it will no longer accept new groups and will wind down its app next month. Twitter has agreed to buy group chat app Sphere, as the social media platform looks to widen and improve its product offerings.(Sign up to our Technology newsletter, Today’s Cache, for insights on emerging themes at the intersection of technology, business and policy. Click here to subscribe for free.)Founded by Tomas Halgas and Nick D’Aloisio, Sphere has raised about $30 million in the first two rounds.“We’ve been watching and admiring Twitter’s growing investment in community-building with the release of Communities, Spaces, and features that promote safety,” Sphere said in a statement.“When we met the team, we were even more impressed by how seriously they are pursuing interest-based community and how much they believe in its potential impact.”The London-based start-up said it will no longer accept new groups and will wind down its app next month. It will work towards helping existing customers find new homes for their communities.Sphere’s headcount of 20 will…
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