Please, I will really need your kind assistance here. This is what I am trying to achieve: on my news website, there is (for example) a URL - nigerianobservernews.com/15082013/news/news1.html. On this URL, the title and the content changes on a daily basis. I want to know how I can use facebook comment in such a way that the comment on yesterday's article on that same URL will be different on the comment on today's article even though the page/url is the same
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You need to scrape your page to refresh Facebook's internal cache.
To scrap you can send a web request to the Facebook Object Debugger and pass your URL, or you can do like this:
curl "http://developers.facebook.com/tools/debug/og/object?q=$url"
Also:
When does Facebook scrape my page?
Facebook needs to scrape your page to know how to display it around the site. Facebook scrapes your page every 24 hours to ensure the properties are up to date. The page is also scraped when an admin for the Open Graph page clicks the Like button and when the URL is entered into the Facebook URL Debugger. Facebook observes cache headers on your URLs - it will look at "Expires" and "Cache-Control" in order of preference. However, even if you specify a longer time, Facebook will scrape your page every 24 hours.
