Social media network Ello is currently receiving up to 31,000 requests an hour from people wishing to join its platform, its founder has told the BBC.
It was initially designed to just be used by about 90 friends of its founder Paul Budnitz.
But the bike shop owner, from the US state of Vermont, opened it to others on 7 August.
It has been dubbed the “anti-Facebook” network because of a pledge to carry no adverts or sell user data.
However some experts have cautioned that it might struggle with plans to charge micro-payments for certain “features”.