A six-month-old hair accessories brand called Insert Name Here -- which vends wigs, extensions, and hair pieces on the web -- has clinched a seven-figure annual run-rate after being founded in November. Social influencers, its three founders say, have been formative to the startup’s success. And the three founders know a thing or two about social influencers.

Insert Name Here (Inh) is looking to follow in the footsteps of socially savvy stalwarts like clothing retailer Fashion Nova and ColourPop Cosmetics, where two of Inh’s co-founders -- Jordynn Wynn and Sharon Pak -- were the first two employees.

Wynn and Pak helped Colourpop become a major player in today’s beauty industry -- thanks in no small part to its mastery of Instagram. Early on, for instance, ColourPop latched onto viral hashtags to amass hordes of followers, sponsored influencer posts, and eventually forged full-fledged product collabs with the likes of Bretman Rock,...