Make it available and easy for your users to connect their social accounts to your service. This is a great way to gain data, this can be done as a form of facilitating and making instant registration to your site through social media or by offering people a reward for connecting their accounts. Follow this guide.Auto-import contacts.

Give options to sync their contacts from other socials, that way the can easily find out who of their contacts are also using your site. This is ideal to prevent the ‘empty room’ problem, and keep your users engaged. Take a look at this guide.