Getting annotations of the Kobo devices has been discussed plenty of time here before. Facebook is the only supported method. But, I've never used it, so I can't help there.
There are plenty of other methods including, querying the database directly, the Annotations plugin in calibre, several tools written by people here. Exactly which is best for you depends on what you want to do with them and your skills. A search should find the discussions. Nothing has changed recently in this area, so they should all still be valid.
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