Absolute truth. I was onboard with G+ early. I handed out invites to everyone I could. I pushed my spouse to use it. Ultimately what killed it was it being invite-only, and mainly only tech enthusiasts were on the site initially. When other people got invited by them, and the newer users didn't see their friends and family on the site, they just left and never revisited it. That was my experience anyways. The model Threads used will be the model that all large social media sites use to roll out new social media products, it just makes the most sense.