[OSM-newbies] What is this randomjunk_bot ?

[Axel Jacobs]

While editing some areas in London, I've come across lots of nodes with tags like this:

randomjunk_bot = reverted edit by FilipeOliveira on 2008-11-26T17:24:24+00:00

Is this some defacement, such as what happens to 'classical' wikis if they allow unregistered editing? I must have removed two to three dozens of them. They are normally to be found by themselves, i.e. not attached to any track, although some of them are part of a track. Should I keep removing them? Could this be done with an anti-bot at data base level? Or am I just over-reacting?

Cheers

Blumpsy