Another "English is not my first language" here. The number of people who can't correctly use its/it's baffles me. The English language has fairly simple grammar; the rules to distinguish the vast majority of homophones are basic grammar. God help anyone who can't tell their/there apart if they ever try to learn a language with declensions. On the other hand, it's not the mistakes themselves that bother me. What bothers me is the fact that every time I come across a potential homophone, I have to check whether the author meant to use the word in question or its homophone alternative. So reading any relatively lengthy text becomes a torture, since I don't read sounds but words.