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People are using shorteners on shortened links, this is the problem.

The most obvious one is Twitter, always using it's own service regardless.



My guess would be for analytics, so it knows how its own service is being used and who is accessing websites through it. It comes with a convenient feature that bad URLs can be taken down on its site.


Genuinely curious: How does it take down bad URLs? And, by "bad", are we talking about 404s?


"Bad" as in malware, phishing, etc. When they recognize that a URL is bad, they can simply stop redirecting to that URL.




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