Yes indeed, this section should be titled The Nordic countries; nonetheless this section is the appropriate one for Finland because for the most part the Finnish etiquette (and culture) is the same as the Swedish one. The T-V distinction is observed slightly more often in Finland than in Sweden but other than that I can't recall any major differences (other than the majority language of course) between the two countries. I was born to Finnish immigrants in Sweden and moved to Finland when I was 10, so I should know.  