Really bummed about Tumblr. I was always a little surprised when encountering people who mostly thought it was for porn, since it was pretty easy to avoid. For me tumblr is more of a gathering place with a pro-Social Justice vibe. I guess some of its sub-communities are based on shared horniness, but it was easy for me to curate a collection of folks posting stuff I found interesting on the regular. More visual than twitter, more dialog based (and less self-absorbed) than Instagram, less special-topic than Reddit, and not "folks I already know" than Facebook.
Jerks at 4chan can continue to be as alt-right and pornish as they want, I assume. From a culture war standpoint this stinks.
https://kirkdev.blogspot.com/2018/12/shape-detection.html Shape detection is on the iPad! As seen on the Newton circa '95 or a '63 Lincoln TX-2... (and I suppose CAD programs have been doing it all along, but still.)