it would be the cell phone.
I hate them.
It's not that I don't use them, I do, a lot, but I really dislike them.
I dislike them for more than one reason, but my principal reason is that everyone under 25 years of age, and increasingly more people in older age brackets as time goes on, are glued to their little screens actually missing life. It's amazing.
People can't avoid checking Facebook or Instagram at the drop of a hat, on their little screens. They sit in restaurants and meetings with other people, looking at artificial electronic life over real life. They've grown unable to enjoy passing scenery from a car or airplane window. It's a sickness.
I also hate the degree of connectivity they have caused, although I enjoy that too. Now, people are tied to their apron stings to each other as never before, even while they also are able to preserve bonds that our highly mobile lifestyle would otherwise strain. There's a balance of considerations there, and I don't know how it comes out, but which ever way it comes out, it doesn't save this technology, which "improves" darned near every day, from being an overall bad development.