So here's 2 things that i've found are related. Don't ask me why, maybe it's sociological, cultural or whatever, but people from different regions tend to have different specific playing styles.
Over the time i've come to expect different styles from players based on their origin. This is not to say one style is better or worse (depends on how good the player is, and that has nothing to do with nationality).
This is not fullproof of course, but just an extra read that can be useful in close situations without any other reads on a player except for their origin.
At Party, you can see the player's country by hovering your mouse over his username.

British & co (UK, Ireland, ZA, Australia...)
Aggressive players. Very loose and bluffy. Many "maniacs" among them.

Germans
TAGs, tight and aggressive is their game

Dutch
Thinking players, very loose, very tricky, good hand readers, may sloplay too much

Canadians
More passive players in general, from tight passive to loose passive

Nordics (Sweden, Denmark, Norway)
LAGs, very creative, sometimes too much since this is limit and not NL

Russians
TAG-LAGs, some are very dangerous, some don't really understand when to mix it up.

Spanish (europe, i specify this for the US ppl who dont know where Spain is)
Not very knowledgeable in general, straightforward players or very fishy, one of the 2

French and Belgians
Kamikazes, gamblers, with the occasional good player

Again, these are based on my experience at Party and Everest.
Let me know if you guys have similar profiling reads based on anything apart from real stats.