Judging by some of the phrases we use when talking here, most of us have been to tvtropes. Tvtropes was the first source I went to when I got into Hetalia (well, admittedly, the fetish fuel wikia was first, but...). Allow me to tell you guys a bit about what my first idea of Hetalia was based on the tvtropes page.
That England was madly in love with America, an affection that America reciprocated but enjoyed teasing him about, and that they were in
some sort of an unspoken romantic waltz that everybody could see but them.
That Turkey had a hopeless infatuation with Japan, but Japan liked/wanted Greece instead. He was outright called a Hopeless Suitor on either the main page or ship tease page, I forget which.
That Sweden was indisputably and canonically gay.
That Finland had some sort of an anguished mental breakdown in the 2010 Christmas Bloodbath over Sweden.
You're probably all thinking that I exaggerated what I heard, but when I'm reading a list of tropes, I base the how much a trope applies to that character/thing based on how much it applied to another character/thing on another fandom. To me, when I see an "All Love Is Unrequited" under a character's description on a supposedly unbiased info source like tvtropes, then I'm going to assume that that character is canonically in love with someone, because that's how it works the rest of the time. For some reason in this fandom, what is considered canon varies wildly. I've found it commonplace for people to call ships canon or "practically canon" when they can be argued against. The declaration by some people that SuFin is canon has been bothering me especially. Just because a ship is prominent/popular does not give you the automatic right to make up shit because nobody will do anything about it.