The blog is called "depressing Finland" which is kind of a Finland meme. It's certainly played up on the Internet but it's got a kernel of truth. I have a couple of very good friends in Finland and I've visited the country and it's a lovely land filled with lovely people. But it's true they can be aloof to other people at first. My Finnish friend joked that Finnish people don't care about others until you get drunk with them, then you have a lifelong friend. That's actually true to an extent.
Finns can be very introverted, which leaves some more outgoing people with the feeling that Finns are anti- (or a-) social and depressed. That's not the case. The Finnish culture just values introversion, privacy, and polite public behavior. This contrasts sharply with the European meme of the loud, outgoing, and rude American, and the two cultures see each other in extremes and play up the differences for humor on the Internet.