I would release the social part first. I assume for the marketplace to work, you will need users. So I think it makes more sense to first generate a user base w

I would release the social part first. I assume for the marketplace to work, you will need users. So I think it makes more sense to first generate a user base with the social part. When you launch the marketplace, you could release it as a feature. It will show your users that you're actively developing the app and are trying to improve the user experience.