It is called "stealth marketing," sir; selling something by unusual means.
In this instance, I add the word "Poland" to the keywords, because it immediately brings over to here many members of the Eastern European ping list....and hence more are enlightened about Norway.
An excellent ping list, sir, the Eastern European ping list, and I enthusiastically recommend it to others--one notices that many members of the Norway ping list visit it too.
Which helps everybody, all around.