We are using the Graph API to read the comments appearing on a Page (e.g. the comments on http://facebook.com/Nike are accessible by crawling https://graph.facebook.com/Nike/posts&access_token=my_access_token).
Question: I see an HTTP DELETE can be used to delete a comment; is there an API to moderate it (e.g. mark it as is_private, something reversible)?
Unfortunately its not possible at this time :( http://developers.facebook.com/bugs/439078329445665?browse=search_506da06b6babc7479209814
By now it is possible to hide facebook comments. The can_hide field will show you if you (e.g. the user/page associated with the given access token) is allowed to hide the comment. is_hidden, well, that one is pretty self-explanatory.
So first, use a GET request to see if the comment is already hidden, and if you can hide it:
[comment_id]?fields=is_hidden,can_hide
If allowed and necessary, you can use a POSTrequest with is_hidden=true to actually hide it.
来源：https://stackoverflow.com/questions/12116847/moderate-hide-a-facebook-comment-using-graph-api