What are the functionalities you need for the social networking site?
Our estimation and timeline will depend on the details provided.
For Development:
We will use drupal or wordpress.
For drupal:
We can create website on drupal 7/8. Have expertize of 5+ years. I have build 50+ site in drupal 7 and 10+ site in drupal 8.
For Design:
We will use Gulp to convert scss to css and optimize css, js, Image. Standard coding structure will be managed.