Apple (like most large tech companies) is indeed a resumé black hole, and knowing people helps, so definitely network if possible. However, applying to the right position, with a good resumé that highlights experience/skills/projects/open source contributions/education/etc. that are directly related to the position, also matters. I am aware of several people who simply applied online and got interviews.

I may be wrong about this, but I don't think Apple bans you from applying to multiple positions within the same year the way some companies do.

There also seems to be a decent pipeline for new graduates (though I think highlighting relevant academic, research, and open source projects can still help.) Internships can also be a path if you are currently in school.

I don't know if Apple recruits on linkedin, but that might also be an option.

Of course connecting right here on HN seems like a great idea as well.