I am using Yoast WordPress SEO for my wordpress site and in the settings of this plugin there is an option where it's giving me an option to use meta keyword tags. In addition the following message is posted "I don't know why you'd want to use meta keywords, but if you want to, check this box." Can someone explain to me this, is it better not to use meta keywords and just incorporate the keywords in the content? What do people do nowadays, are meta keywords still being used? Thank you