An extension beyond the "like" mechanic on some software platforms where you can "react" to a post with various emojis or preset reactions like "happy" "sad" etc.
React to page - we won't have this, because reactions are a non-constructive Attention sink, and the only thing we want to incentivize users to do is WRITE MORE, so if you wish to "react" to someone's thing, you can react using your words. Construct your own thought.