The mastodon.social instance is under extremely heavy load, I don't do tracking so I don't know where exactly people are coming from but I know there's been a few high profile mentions of Mastodon in media/on Twitter. If this keeps up I will scale up further (I know all the arguments about this instance growing too big in the federation, but if the internet is already at your doorstep, should you go down or scale up? Scale up imo)