I am in a great "problem" so to speak , and I need opinions to decide.

The problem is to create a social network without knowing the number of users who use it (but if thinking if they were sufficient ) .

The question is which language and framework to use .... I do not mind having to learn new technologies and / or languages ??.

I am among

PHP ( Laravel - Symfony - other? ) Ruby ( Ruby on Rails 4? ) Javascript ( Ember , express, locomotive , other? ) Python ( Django ) Java ( Grails , Play, other?)

I have experience in both PHP and frameworks. In Symfony developed part of it, but I got tired having to do a thousand configurations for all .

I know very little about Ruby , but I saw very easy . I do not know are saying the performance.

Javascript costs me to get used to their paradigm , and do not know if at all sure to cover everything with Javascript.

Django and python ( very poor knowledge )

Java , experience in data structure and android , but not web .

Regarding the / s databases: In my head I have to MongoDB and costs change of opinion by another database with respect to documentation and EASE performance . But .......... frameworks have no support at all clear .

I also thought of mixing technologies for using a tecnlogía backend and the frontend other. As I read in the new social network Origo . They use Symfony for REST and javascript for the frontend . ( Backbone , Underscore and RequireJS )

What do you recommend me ?