We are getting hit quite intensively by a wave of spammers.
They seem to have registered manually some 50 usernames over the past days and then started to post all kind of silly posts as you might have noticed.
The procedure is simple. Stay calm, walk away from these topics and wait for the spam police to arrive.
We are working to clean up this mess. Apparently there isn't much defense since these aren't bots but rather some humans doing all the grunt work.
Moderators: If you have permission to delete or hide posts then do proceed. When you visit the member profile, you can also mark him as "spammer" to prevent the person from making further posts without moderation.
Happy spam-season hunting!