push post time to likes

gistfile1.txt

def extract_likes(posts)
    u = Array.new
    posts.each { |post|
      if post.has_key?("likes")        
        likes = post['likes']
        if likes.has_key?("data")
          users = likes['data']
          users.each{|like|
            like << ['date', post['created_time']]
            u.push like
          }          
        end
      end    
    }
    return u
  end

Error:undefined method `<<' for {"name"=>"Mario Coletti Bologna", "id"=>"100004027221950"}:Hash