Hi everyone, I've been experimenting with Facebook for about a week now.
I am currently working with iPhone offers. Currently, I see that my audience reach is very low,

Note: I have only "iPhone" and "Apple" added to my detailed targeting.
Question: I don't understand why my Audience Reach is so low even though there are a ton of users on facebook who have the same interests who reside in the US.
(I see that there's a list of top 1000 keywords available from here. I tried adding the most popular interests into my adset but that number doesn't change much.)
Do I add interests to increase this number?
I am a bit confused - Facebook allows iPhone sweeps ads? or are you cloaking?
typo there. Fixed it.
Your reach is that low because of your budget. The bigger your budget, the more people you can reach (assuming ceteris paribus).
You can see that the total audience for the indicated interests is over 140M on FB.
Btw. your account will get banned quickly if you plan on promoting sweeps through fb.
Firstly, you definitely need to cloak if you are running BH stuff like that.
Optimise for conversions to website instead of manually targeting. Let Facebook do the work for you. Either get the advertiser to implement your pixel on the conversion page (CR) or implement it yourself for clicks on your landing page (CTR).