This is what in Germany is called 'Impressum'. If your website or blog is registered in Germany you have to add this, no matter, whether you are selling something or not. As long as you add or amend content regularly you have to do it.
In fact it means you have to publish a litigable postal address plus an e-mail address plus your telephone number, so that just anybody can obsess you, if he or she doesn't like what you are doing.
One convenient side effect is that, if you don't have an 'Impressum' on your page, one of our way too many lawyers, some of them suffering from dwindling income, can threaten you with a claim and you have to pay his or her bill for such a letter. And, of course, an act like this supports Germany's obsessive way of checking and regulating its population (which never is for the sake of something but always to somebody's financial advantage).
So, here we go:
Im Finkenschlag 15
51429 Bergisch Gladbach
molly(at – please replace)mollyheyer.de
No, I will not provide my telephone number here.