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I like this idea. I'm not worried about the potential for "drama" because disruptive users already have many other tools at their disposal (such as, say, *posting*), and in practice this kind of disruption is quite rare outside of spam - even on massive sites like Stack Overflow. (Even there, nonsense posts often turn out to have been intended as spam seeds.) Aside from that, **reactions are not anonymous**, by design, so marking a post this way involves having some skin in the game. As such, I think such a reaction *should* explicitly mention vandalism (a more precise term than "abuse").

Ideally, **using such a reaction should also** cast the corresponding flag automatically, rather than simply asking the user in the react tooltip. After all, there's no good reason *not* to flag the post. On the other hand, using such a reaction should probably require explicit confirmation to avoid mistakes.

One possible drawback of using reactions like this is that a new user might stumble upon a question reacted to as spam, before a moderator gets a chance to look at it, and wonder why the site has users who get to declare that something is spam but it doesn't actually get taken down. **Ideally, the template text** for a spam reaction **should preempt** that question. It could even say something like

<section class="notice is-danger">Flagged as potentially spam or vandalism by [user list] (and possibly others)</section>

It would be worthwhile for a reaction like this to take up the extra screen space compared to other reactions, actually.