How do some posts to yahoo answers have links that work while other links dont?

I read & reply to yahoo answers.When people post a link with their question sometimes the link does work and you can go to it.Other posts there are links that dont work yet some people seem to be able to go to that site. I use mozilla firefox most of the time.Those who post links that do work seem to have a... show more I read & reply to yahoo answers.When people post a link with their question sometimes the link does work and you can go to it.Other posts there are links that dont work yet some people seem to be able to go to that site.

I use mozilla firefox most of the time.Those who post links that do work seem to have a certain amount of points.My links work when I reply to a question that requires a link.How is it that some people are able to see a link on a post?
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