Most of the sightings are of manned aircraft. This is classic "mass hysteria" which is amplified by social media nowadays.

Yes, there are probably a few more drone flights in the sky than there were a year or two ago. There will be more a year or two from now as drones are used for more things by more people. I'm not sure why people feel these are any more threatening than there being more cars on the road or more ways for a social media site monitoring your online behavior -- things we just accept without notice or much thought.