Shahed Khan's own account: the team took the recording extension built for OpenTest and launched it on Product Hunt in June 2016, generating 3,000 signups the same day.

“launched it on Product Hunt in June 2016, and had 3,000 people sign up on the same day”

Vinay Hiremath, in a third-party as-told-to Business Insider piece (not founder-published, so treated as implied rather than stated), credited the Product Hunt traction partly to staying active and answering questions and comments in real time rather than treating the listing as a one-way announcement.

Co-founder Joe Thomas (writing for the whole founding team, which includes Shahed Khan) describes one Atlassian employee starting to record and share Looms five days after the June 2016 launch.

“the first @Atlassian employee started recording and sharing looms”

That single early user's team grew into full company-wide adoption years later, which the founders point to as the viral, bottoms-up mechanism that eventually made Atlassian a customer and then an acquirer.

“Fast forward four years and they became the first organization to purchase thousands of Loom licenses”

Vinay Hiremath, in the same third-party as-told-to piece (implied, not Shahed Khan's own words), described staying personally active on Twitter and engaging with anyone tweeting about the product as an ongoing practice.