Hi there,
How are you doing?
I am expert and experienced App developer.
I have gone through the project requirement and got your points, I have already created app like Face-book, so it will easy to me creating an app like Facebook for you for all three platform, with responsive admin panel.
I am having questions related to your project So I am inviting you to please come to the private chat and lets discuss the project (I will show you sample of work on chat)
Please feel free to share your queries, we will glad to assist you.
I will provide you the best quality work with in your budget and time frame.
Awaiting for your reply,
Thanks