Talk:Flow and Talk:Beta Features/Hovercards have been hit with massive spam attacks. Some blocks and perhaps website blacklisting seem to be needed, as well as deletion of the Flow posts.
Topic on Project:Village Pump
I've added 16 more domains to MediaWiki:Spam-blacklist, and will delete the topics that are still visible or just hidden. I've emailed the Flow dev team, to emphasize the priority of confirmedit integration.
Thanks again, for everyone's help with this.
It's back (on Talk:Beta Features/Hovercards only this time). More IPs to block, posts to delete, and perhaps websites to blacklist.
Also note header spam.
Jorm has semi-protected the page, whilst the developers work on the extension-integration. I've added some more domains to the blacklist, and deleted the posts. Most of the IPs only make a single post, so blocks probably wouldn't help. Thanks again.