A rather more technical post than usual, but if you are used to playing around with HTML tags or fiddling with the innards of systems such as WordPress, this post has some good news that could make your website perform better in search engines…
The multiple URLs problem
It is quite common for a page on a website to be accessible via more than one web address. For example:
http://www.libdems.org.uk/news/new-government-bailout-is-blank-cheque-131421437;show
and
http://www.libdems.org.uk/news/new-government-bailout-is-blank-cheque-131421437 (i.e. without ;show at the end)
both link to the same page.
There are two reasons this might be a problem. First, a search engine may fail to realise that these are the same page and so search results get clogged up with duplicates. Second, some people may link to one version of the URL and other people to the other. Splitting links between these two versions can mean the page performs less well in search engines than if all the links were to just the one.
Search engines are pretty good at trying to deal with this sort of problem, but they aren’t perfect.