Spurious “Lifestream Event” tweets

If you’re wondering about the “Lifestream Event” tweets which keep appearing in my Twitter stream … well, so am I! I don’t know what’s causing them; it’s not a new plugin (because they’ve not changed in weeks); I thought it might be a problem with it polling for Google+ updates, so I’ve disabled that feed but I’ve just seen another tweet. I’ll keep trying to debug this but if anyone has tracked down this problem please let me know.