What kind of work are you looking to get done specifically? Two things that I would do is: spend about 5 hours a week on Quora tapping iOS developers, spend about 5-10 hours a week on StackOverflow tapping iOS developers. All non-spammy.
Other things to do are: guest-blogging, requesting reviews.
Work requirements would include advanced analytics of incoming links to see how all of the off-site activity is performing.