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The searching would search: (searching is not a part of the OP's idea)
(1) the thread title (and ideally the post text).
(2) the message text
(3) label text.
(4) might be useful to include the forum name where the post appears as well.
This Bookmarks feels like an admin / power user thing.
Enabling Bookmarks to be viewable by others could be interesting (Probably better than profile posts).