helper.rb

  SITES = {
    facebook: 'http://facebook.com',
    twitter: 'http://twitter.com'
  }
  
  def icon(name, url)
    content_tag :li, link_to(name, url, class: [:sticons, name])
  end
  
  def social_icons
    [SITES.map {|name, url| icon(name, url)}].join.html_safe
  end