Well cerberus is a decent boiling pot of various nationalities and languages but I'd say most stuff happens in english with some german and some french as well. You will also get a spanish person here and there and then others in varying amounts.

As for PF it's not dull but you certainly won't have multiple pages of parties to scroll through in PF. There are quite times where there won't be a single party on there and there are highly active times where maybe 2-3 pages of parties will be looking for things.