I read the question.
I read the blog post.
I visited http://Blicup.com.
I even watched the video.
I don't have an iPhone.
I cannot try out Blicup.
There does not seem to be any unique feature of the iPhone that Blicup requires. An interest in global chats about trending topics does not seem like something that would be more common among iPhone owners than those without.
My standard advice is build a web version so that:
1. More people can try out your product. This increases the chance that a few people will love it.
2. So that you own your customers. Apple owns people using the app store. Google owns people using the Play store. Ownership means that you can communicate with users directly using whatever channel works.
3. So that you can iterate whenever and however you want. The web has no approval process.
4. There is control over how your product is 'displayed'. Everything in the app store looks the same and the sameness is that of a .NET webforms quality enterprise template.
Good luck.