Ted Nelson's critiques are good. Tech/Culture needs critics. Ted also tried being a culture-tech builder, and Xanadu just didn't work out. Despite several attempts, lots of resources spent...

Its ideas probably influenced Twitter. Because they were good ideas. Could've been independently discovered in the Platonic space of ideal tech-powered media too...

Yes, great social collaboration happens on Twitter. A bunch of inane squabbling and criminal threats too.