I think we should discussed here more briefly due to panda and penguin updates most website get affected. If you searched for keyword "buy facebook fans" then you can see a website in 1st position. You also see that that website is in top 1-5 for most facebook related keywords. Some keywords are highly competitive and nearly 45-60k searched per month. I noticed that this website never ever affected by any google update so far. I checked the backlinks of that website, a lot of profile backlinks made. But this website is not loose it serp in any update. Which makes me completely confuse. I also made same profile backlinks with target of 20 keywords, initially i noticed serp improvement, but after 24th I found my ranking decreases and now i am out of top 30. So can any one take a look at the website and post their reverse seo feedback.