I'm building a website for sale something and i created a page " domain/..../" . Special, my friend create a blog post with the same url ( he used plugin to short url) and he create to a the same url "domain/.../" . And my keywords of my page are descrease on 2 weeks from top 5 to 40 and now, i can't find my url on top 100. I want to know that my url has been penalized? And when will my url reappear after I delete the post url?