how twitter checks all links created using its own shortening link service-t.co- to help fight phishing and malware scams?

Is it based any criteria, patterns or just mere content of the blocked site which is the reason for blocking .
gogo daffamaster student Asked:
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gogo daffamaster student Author Commented:
i am writing my research in detection of spam URL  using machine learning algorithms
i need a link or more information to find a good entry point to my research
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Phishing

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