Considering the popularity of GTA Online, chances are many of you who are reading this now are doing so because you tried to log in to the game but were unable to. No, there isn't an issue with your game, your console or your internet connection. In fact, there isn't any issue at all — only routine server maintenance.
But how routine is it, really? The tweet from Rockstar support went out yesterday, informing everyone that the maintenance will occur. This was followed up by another today when the GTA Online servers were taken down — in tandem with the Social Club. Now, server maintenance isn't anything special in a multiplayer game.
However, having your website affected by the server maintenance of the game is strange. GTA Online uses an atypical peer-to-peer system, saving Rockstar tons of resources that would have been spent on a massive server park strong enough to support the player base.

It also limits the control Rockstar has over the game servers, which is the main reason why solving the hacker issue has been so difficult. It also makes server maintenance pretty time-consuming. Most importantly, however, it makes hosting the website and Social Club on the same server impossible.
So why is the Social Club down along with the other platforms? Initially players only reported that the Xbox One and PS4 platforms went offline, but they were closely followed by the others and eventually the page tracking the status of the game servers was updated to show everything as down.