Earlier quoted context omitted.
I am sure many of us know or have known people who browse facebook, twitter and youtube at work all day. Anecdotal evidence or the actions of of a tiny minority is hardly helpful to any meaningful discussion and can be used to 'close down' any initiative.
It might be anecdotal which I doubt but then how do we know this is action of tiny minority. I should add I do work from home certain times but I take it as privilege rather than a right to work whenever it is convenient to me.
Is it "a short account of a particular incident or event, especially of an interesting or amusing nature"?
Its an account of "in my experience" or "the people I know do this" -- its not hard facts obtained through the scientific method (ie controlling for other factors and for biases). That makes it, by definition, anecdotal.