Fortnite is the biggest game in the world, but it's not the biggest game on Twitter. The Washington Post has noted that the most talked about game on Twitter for 2019 was a free-to-play Japanese RPG--Fate/Grand Order, which first released in Japan in 2015.

While the game is available in the west, it's much bigger in Japan, and has been for a while--in fact, it was also Twitter's most talked about game of 2018. Fortnite came in at number two for both years, and several of the titles on the list are either exclusive to, or at their most popular, in Japan.

Although specific numbers are not given, it seems that the "most talked about" game equates to how many individual tweets are being made about each one. In 2019, over a billion tweets were made about games, which is up 20 percent from 2018.

Fate/Grand Order is a turn-based RPG, and the characters you command are mostly based on historical, literary, and mythological figures that are unlocked through a gacha mechanic. It has anime, manga, and cinema spin-offs, and there's an arcade version in Japan.

Here's the full top 10 for 2019:

1. Fate/Grand Order
2. Fortnite
3. Final Fantasy
4. Identity V
5. Granblue Fantasy
6. Ensemble Stars
7. Monster Strike
8. PlayerUnknown’s Battlegrounds
9. Minecraft
10. Super Smash Bros.

Epic Games has little reason to be upset about a second-place finish, though, considering the game's registered player count is over 250 million.