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Those buttons will have been created by the company themselves and styled to look like a Facebook button. I'm sure they will create post to their Timeline saying something along the lines of "I want this...insert link to product".
You can do this using Open Graph. If you have no experience with it I would suggest starting here:
I would think that Google does still crawl these sites (or have just blacklisted them). Therefore, they would still have a negative effect on your client's website.
I would recommend taking a look into Google's new disavow tool - you will be able remove the association with bad links.
Dr Pete recently wrote a great article on the disavow tool - http://www.seomoz.org/blog/googles-disavow-tool-take-a-deep-breath
This really shows the endless possibilities we all have for link building. I'd have never thought a bank like Barclays would put lots of hidden links on their website just by talking at one of their events.
Pretty amazing stuff!
Some links actually provide 'business services' that you would expect Barclays to have a relationship with but of the other links seem very suspicious - like the food websites.
Even though they're well know brands, the Innocent drinks and Eat Natural links should not really be in a 'Business services' section. It's very unlikely that a visitor would see these links so it must be purely for SEO reasons - even though these websites have a much lower authority than Barclays (I doubt it is for their benefit).
Not quite sure how a site like http://www.kiboshpiperepair.com/ have got on there either! It is very very interesting
I remember a member of the SEOmoz team explaining that it was an issue with their system and both Great Britain and United Kingdom yield identical results. It is just two names for one Google.
I think they are looking into this further.
If it is your own original content and more 'valuable' to the end user than the article content then I would put it above the fold.
If it is not then I would keep it below the fold.