URL shortening web services/web sites

Does it matter which URL shortening web service you use when shortening URLs? Why will one choose, say TinyUrl over any other?
And is their a lifespan for the shortened URL, will there be a guarantee that it will always be available after it is created?

Answer

Jeff Atwood wrote that URL shortening is destroying the web. His argument is that URL shortening distorts PageRank.

The internet is the house that
PageRank built, and it’s all
predicated on hyperlinks. Once you
start making every link your special
flavor of “shortened” link, framing
the target content — heck, maybe
wrapping it in a few ads for good
measure — you’ve completely turned
that system on its head.

Attribution
Source : Link , Question Author : Julius A , Answer Author : Anthony Mastrean

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