Overwatchers was a player/team finder built in the run-up to the release of Blizzard's next goliath title, Overwatch. The site let people sign up and customise their profile with information such as their playstyle (casual or competitive, for instance), typical times of day played, preferred characters, and so forth. Users could also search for other people based on those parameters, with the site aiming to connect similar people together to enjoy their Overwatch experience better.
Overwatchers went live on Overwatch's launch day but all announcements of the site were drowned out by a sea of excitement over the launch, and other websites which also aimed to match players together (albeit much simpler and less reliably) were gaining traction despite offering a far worse experience. Ultimately, with Overwatch announcing and releasing a looking for group tool, the website was retired.