Detecting Likes by timestamp

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When reading a feed using this kind of construct :

var fb = new Facebook.FacebookClient(longlifeaccess_token);
dynamic fbFeed = fb.Get("me/feed");

I notice that when a post is "Liked" its two timestamps are not modified.

If I am controlling a feed based on new posts, how can I detect that an older post (which by definition I am no longer looking at) has just been Liked ?

Thanks

asked 1 min ago

Martha

10