Is it possible to offer a user a bonus for publishing (sharing) a link to your application in his social network? networks?

Question

iOS

Now apple has a fairly strict policy regarding all sorts of tricky maneuvers, such as offering the user some goodies for the review, tricky windows for reviews, when when the user gives a rating below 4, we give him our review form, and if 4-5, then we suggest leaving a review in app store, all this is prohibited.
1) I think, can I add, say, a button like "Get a bonus" by which the user will be asked to share a link to the application in the social. networks and for this will be given additional. content?
2) In my opinion, advertising other applications from your application is also prohibited or not?