Welcome to the Candy Crush Saga Community
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Hi and Welcome to the King Community
Facebook is as you know the social media. Whereas the King.com is the King Saga games' official website. You can find many things related to King games in that website .A King account allows you to play with other active players, save your progress so you can keep playing on other devices
You do not have to start from level 1 again on Facebook... but, for this, you will have to "sync" both Facebook and King.com accounts. Then, whichever platform you open your game, you will be at the same level.
Here is a very helpful article that informs how to --> "Sync our game progress"