It seems like Sunday mornings is now the preferred time to play games by yourself or with friends as Steam continues to break records of concurrent users.
Just last week, the numbers of users online was close to 20 million, but after a big downfall, it went back up again to reach more than 22 million users, twice. Its biggest record was achieved today with 22,670,375 users between 10am and noon.
Again, the most-played games were CS:GO and Dota 2. Will this new record be broken again? We may find out next weekend.
[Source]: Steam: Concurrent Steam Users (most recent 48 hours) – [Archive].