devise Add Gems in Gemfile for OmniAuth


Example

gem 'omniauth-oauth2' , '~> 1.3.1'
gem 'omniauth'
gem 'omniauth-facebook'
gem 'omniauth-twitter'
gem 'omniauth-gplus'
gem 'omniauth-linkedin'

Run the bundle install command, restart your server and off you go!