How do URL shortening service earn?

Posted by Rakesh Juyal on Stack Overflow See other posts from Stack Overflow or by Rakesh Juyal
Published on 2010-06-06T18:33:48Z Indexed on 2010/06/06 18:52 UTC
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subjective

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non-technical

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url-shortener

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nonprogramming

Yesterday i got to know about one more URL shortening service Saf.li. I think there are hundreds of websites offering such service. I always wonder how do such sites earn? After all they need money to host their data and code.
Also, i really don't understand why techcrunch said this:- http://techcrunch.com/2009/03/30/if-bitly-is-worth-8-million-tinyurl-is-worth-at-least-46-million/

Is there any one who can explain me this?

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