I have to ask: can you give any examples of when 'ketä' is used wrongly? If I'd ask 'Ketä sä tarkotat' by those someones, would that be wrong or f.ex. 'Ketä on tulossa' to a party or whatever, would that be incorrect? Should I use the form 'keitä' instead? I think I wouldn't normally ask 'Ketä toi on tos kuvas' but I'd use the 'kuka' but is the issue about the correct use of finnish in speech or only in written language? Which one bothers you more?

blaah, i'm not supposed to be witty