To perfectly sum it all up into a single picture:
While it is no denying that technology helped better society by attempting to simplify basic human tasks and connect people more easily. It is also because of these things where the negatives are coming from. Technology is slowly dehumanizing society.
Before smartphones were invented people actually talk. Society really took the time to know what's happening around their neighbourhood. Kids used to play outside, running and playing with other kids. But the moment they were introduced to technology it's like they were instantly absorbed to it. They were so attached to technology that they are ignoring their surroundings. People now live and play online. So yeah, one negative effect is it makes human zombies. It is slowly dehumanizing society.