1. I hear a lot of English in Finland, mostly slang words or brainrot tho. I sometimes hear people speaking English in Finland, but most of those don't know Finnish. I don't see a lot of English used in Finland except some separate words.
2. I'm not in the Finnish side of social media so I don't really know how much Finns use English in social media, but I would say that most Finnish teens/young adults use some English in social media.
3. I think that in the future English in Finland will be used maybe even more than Finnish among the young people. I use English more than Finnish in my daily life which I like, but I have started to forget Finnish words and sayings. I don't like that, because Finnish is my native language after all and it's more unique than English.