Golfdriver97 has hit this one down the fairway. If you look through these lists you may find apps that reference AT&T when you have TMobile, Motorola when you have a Samsung and many others that may not match up with your device, carrier. or apps that recognize. Someone found something that works and rather than putting in a lot of effort to make their own or reinventing the wheel they borrow from something that already exists and works.
It's been a while since I've seen a question about the activity log but really this information is not for us casual users. You're not apt to find something truly weird going on here, or catch some app up to no good, it usually just makes people paranoid for no reason and wonder why everything is com. (dot) instead of (dot) .com.