Seen any strange events popping up in your Facebook News Feed lately?
Maybe something very mundane, like a niche event at a school you've never heard of? Or perhaps something a bit more unusual, like worm-charming or mushroom-growing classes?
Well it's not advertising, and it's not an accident.
It's actually part of what seems to be the latest Facebook trend among British teens: making random events pop up in their friends' News Feeds by saying they're going to attend, even when they're obviously not.
One of the first examples of this was a "Year 10 Parents Evening" in Norwich which ended up going viral in a spectacular way.