style: if ! changed by unless

- if ! changed by unless as it is more readable
- !object.blank? is equivalent to object.present?, also more readable

app/models/contact.rb

@@ -7,7 +7,7 @@ class Contact < ActiveRecord::Base
             format: URI::regexp(%w(http https)), allow_blank: true
 
   def has_social_media?
-    return true if !facebook.blank? || !twitter.blank? || !googleplus.blank? || !instagram.blank? || !email.blank?
+    return true if facebook.present? || twitter.present? || googleplus.present? || instagram.present? || email.present?
     false
   end
 end