There are situations that social networks need to worry about, consistency wise. Imagine a newly battered spouse unfriends their partner before making a post ex

There are situations that social networks need to worry about, consistency wise. Imagine a newly battered spouse unfriends their partner before making a post explaining why they're getting a divorce. If these two events get mixed up the perpetrator can end up reading the post. Also, ironically enough, most of the global financial system actually operates very inconsistently. It can take days for transactions to clear, and there's a bazillion quirks based on local law and bank policy. So in practice banks use double entry accounting with reconciliation. If something got messed up they issue a new compensating transaction.