I don't actually know, but I'm going to hazard a guess that it's the same as in the US: dating apps. How else could you possibly meet people to date? This isn't a joke question, because I honestly have no idea.

The standard ways of meeting partners, according to surveys, have been: school, work, church, friends, family, bars, online. School isn't possible if you're not a student any more (i.e., most everyone over 25), work is generally frowned upon and pretty limited unless your workplace has a lot of turnover (which is bad for other reasons!), church isn't useful if you're not religious (as is the case for Sweden I'm sure), friends and family have limited social circles of singles, and bars are a great place to meet alcoholics. The surveys I've read for dating in America have shown that all these methods (except maybe school) have been declining for a long time, while online has become the #1 method.