Fascinating. Google trends doesn't say much about this network when searching for "mastodon".
But the spikes are exactly on top of album releases from the band Mastodon in the last 12 years.
And the last spike?
The lastest Mastodon album dropped 31. march, right before the Great Mastodon* Surge of April '17.
Coincidence? ... probably.
(*the social network)
@zatnosk I guess that also Mastodon users (the network) will do less research on Google than others, because it's a public using more open-source softwares and relying less on Google. I very rarely search on Google, discovered Mastodon on Twitter and some blogs for instance.