When adding comments that contain embedded URL links to posts on Pages, it seems that Facebook sometimes expands these links (i.e., displays an associated Preview of the link), and sometimes does not.
Is there any underlying logic that deterministically governs when links are or are not expanded?
I've not yet succeeded in finding any fixed patterns, despite experimenting with such factors as:
- whether or not I have Admin rights to the specific Page in question.
- on Pages for which I do have Admin rights, which "voice" I am using when making the comment. I.e., whether I "use Facebook" (or perform "posting, commenting, and liking") either "as that Page" or "as myself".
- whether I explicitly include the URI Scheme in the URL or not; and if so, whether I use "http://" or (if relevant) "https://".
- which web-browser I use when posting the comment: Chrome or Firefox.
For all combinations of these factors that I've tried, sometimes the link in the comment gets expanded, and sometimes it does not.
And in those cases where the link does not get expanded, I've tried refreshing (and even completely restarting) the browser -- an action that I have sometimes found helpful with other Facebook-related problems, but not with this particular problem.