What would those be? I thought the primary mistake Google made was in building Google+ after everyone was already on Facebook (and trying to force people into it)
There were multiple mistakes other than that, but for example initially you needed an invite to Google+ and they artificially limited the number of invites. This worked great for them with gmail, creating an inflation of demand and a fomo effect but with Google+ it just meant if you were on Google+ noone you knew (who didn't actually work for Google) was on there and if you weren't on Google+ you couldn't get on unless you knew someone who worked for Google or was one step removed.
They built a business model that relies on network effects and then deliberately killed the network effect during the adoption phase.
Good point. I totally forgot about that dynamic. I now recall that by the time I got an invite I was already kind of sour on them. Not that I was actually excited to join, I just didn't like them inducing in me a feeling of being not one of the cool kids.
Yeah. Exactly the same for me. It was a serious misstep because by all accounts some of the functionality (circles in particular) would have been a significant step forward for social media in general. By the time they realised their mistake and started pushing it (heavily) the ship had sailed.