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The most important thing about FB like or even Google + or Twitter follower is, they are those people , who know you company/product/services or a prospect. When they come to your page, they read it try to connect themselves with it and consume information/content present. This is how it creates value ( both SEO wise and increasing awareness wise)

But when you pay someone to get 1000 like for 20bucks, on 1st hand those people/account are going to be fake accounts and no matter if you have 1million fake followers/fans, its not going to add any value to you.

Earning like/fans naturally is going to create value for you, because someone after review your page/content/information has decided to like you.

Also there is a huge risk involved of getting your account banned by facebook in like schemes and even if it is not banned, you are not going to get any value.

In one line - Just imagine yourself as a consumer, you are not going to like 100s of companies or page. Even if you like them, they need to be in you geographical area ( if they offer their services locally), you must have at any point of your fan period ( Time your are fan of that page) commented/liked the post of a particular page.

There are pros and cons for every action.

With setup wizard creating experiment has become very simple process. You can segment your results by using Advance segments.

Also with experiment, you don't have to install multiple pages of code, there is only one code snippet you need to include on the page.

Most importantly, google is working on adding more functionality such as Experiment suggestion. additional goal conversion option and Status email about your experiment performance.

The page rank for your website is 2, thats what i can see.

Most important thing for you is to see if there is any  dramatic change in traffic, rankings and pages indexed by google.

You also have to check inner pages PR, if these pages also have drop in PR as compared to  past?

Do also check for warning in google webmaster tools.

If Answer for above questions is NO, don't worry and focus on your Linkbuilding and other SEO efforts.

No you don't need to do it every time you add content. If you have sitemap in place ( On your website), it will automatically update itself.

Hello VIncent,

You can simply email the webmaster to take down your link, I am sure most of them will honour your request.

Secondly and most importantly, how do you conclude that these are the only 4 links which has attracted penalty during penguin update? If you entire link profile is natural and good , you don't have to be worried about it, but in your case you need to check your entire link profile and do in-depth analysis.  IF you have 96 good quality links out of 100, 4 bad links are not going to impact you.

Thanks,

Dheeru