gistfile1.rb

if user_signed_in?
  case current_user.provider
  when "facebook"
    facebook_profile_image_path("#{current_user.uid}.jpg", :default_image => "Users_iaysut.png")
  when "twitter"
    twitter_name_profile_image_path("#{current_user.uid}.jpg", :default_image => "Users_iaysut.png")
  else
    gravatar_profile_image_path(current_user.email, :default_image => "Users_iaysut.png")
  end
end