With people learning about Fediverse, I’m guessing Instagram. Why? Because IG has become overwhelmed with influencers and TikTok-like junk. The initial wave of people into Pixelfed will be techies that want a break from that scene. Their friends will hear about it. The friends that just want to have an IG-like experience to share their pictures with friends while avoiding all the rest of the noise will slowly transfer over. Once they hit the critical mass, the switch will happen. This will take at least another year or two.