Several years ago when I first took a DNA test to trace my ancestors only a few hundred people showed up on it that I had shared DNA with. When I checked again just a few days ago the number of people in the world that I had shared DNA with was just over one hundred thousand.
According to my DNA I have almost three thousand five hundred fourth cousins or closer, and over ninety eight thousand fifth to eighth cousins in the world. As far as I can tell the test are pretty accurate, several of the ones on my list of relatives are people that I personally know and know how I'm related to them....