Errant Employee – Web Misuse – Help Please

Hi Everyone

I look after the IT services for a workgroup of around 30. Every month I
find time to run random web logs on my users. This month I have found
one user who is spending their entire day on YouTube/Facebook/Google.
We are a tight knit unit and I want to approach the user or line manager
in the most diplomatic way. Does anyone have any tips/anecdotes to
give me the best way to approach this very sensitive issue

thanks

biffo