Twitter might be a bad example, given that's exactly how it rose to popularity

I think Twitter is a complicated example: it thrived when they were building a product which the developers wanted to use personally, which included embracing ideas which other developers had made for their users.

The decline started when they started building what the VCs thought would be a winning lottery ticket: that was when they started closing the service and everything became focused the pitch to advertisers without enough balance on what their users might want.

I think what killed Google Glass was more price and availability. Combined with concerns over the camera, that solidified the whole glasshole thing.