Caching it like you explain would be required as a minimum but still if we're talking thousands of users and millions of posts I just don't know if the math will work. As is when I search for an IP address it strains my server and I only have 1000 users and 1 million posts.
Very few thing are impossible but I'd imagine this world require a new more efficient way of storing IPs... Probably extra data when each new post is made...
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