Launched last year, the San Francisco-based platform is looking to establish itself as the standard bearer for digital audio and has already inspired copycat products from Facebook and Twitter.

The social media sensation had “grown faster than expected” after an earlier capital raising in January and servers had struggled with the amount of users, the company said on its blog.

Venture capital firm Andreessen Horowitz led the latest funding round, with participation from funds DST Global, Tiger Global and businessman Elad Gil.

The company did not give details on figures, but Bloomberg reported this month that the financing would value it at US$4 billion, citing sources close to negotiations.

The app, which is invite-only, allows users to listen to live audio-only chats and sometimes participate in them.

Taking advantage of the pandemic and celebrity appearances such as Tesla boss Elon Musk, Clubhouse has popularised long conversations, whether they be chats between friends or celebrity interviews.