I am happy this was brought up.  I have been approached by companies to add in &quot;SDKs&quot; of this sort.  They usually offer to pay you per user.  When you have scale, these companies while the app is open can scan for other media they need to link. I have witnessed iOS apps processing web ads, tv stations and radio ads. The freakiest was watching the software understand a tv show was playing, detect which show, then off a competing ad in the app.<p>It is quite amazing what a phone can absorb while sitting in a living room with a loud tv blaring (which is most of america).<p>See more: <a href="https:&#x2F;&#x2F;www.audiblemagic.com&#x2F;" rel="nofollow">https:&#x2F;&#x2F;www.audiblemagic.com&#x2F;</a> (Edit, you will see &quot;Facebook&quot; as one of their customers.....)