This user, exists on every single SE network. Makes no contributions, no rep, no badges except for 2.
A silver one for 30 days activity, and a gold one for 100 days activity. On every single site.
The one site he does have rep on is for answering a question on Server Fault. The topic of the question he answered i hear you ask? Scheduling automated jobs.
This could be a huge coincidence, but i highly doubt a user has been logging in every day for 100 days on every single SE site without making a single other contribution.
All activity badges are awarded on the same days too.
Is this sort of behavior allowed? It's doing no harm but i imagine that there would be a very quick resolution if a user was discovered to be gaming the system for any other badges.