A lot of these sites are badly coded garbage. I would ignore these sites.
Best posts made by kdaly100
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RE: How a google bot sees your site
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RE: Is traffic useful without links?
Like the EGOL humour plus agree with EGOL 100% here. 100 hits and getting Facebook like is pretty good reward. I assume that you are linking within your site as well to keep people on the site.
And to answer your question you should always try and write articles that are useful to the Internet community but also to you. Socialize the pages as suggested but if you can write this quality on cities I am sure that you can also write it on Air Conditioners.