Business social media web app

I need a web application that will allow people to log in, and find people that have the similar interests as them. In the application, please send me what segments would you need to make this, and tell me how much money would each segment cost (e.g. Database, Front-end, Back-end etc.).
Also, I would need to know how much time would you need to make something like this.
If you read the whole job posting, please write answer to this question at the bottom of the application: 1+2=?
Good luck everybody!