An interesting fact for non Polish speaking readers: for non-official writing we often don't use diacritic characters at all. It makes writing faster. With the raise of spell checkers it fades out, but still, if you write without diacritics often you will be well understood.

Second interesting fact: it is very popular for software and online apps, especially not developed in Europe to ignore diacritics. Not only polish ones, but also french, german etc. You get weird characters instead or can not write properly altogether. I hope the article will put a highlight on the issue.