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i am writing my research in detection of spam URL &nbsp;using machine learning algorithms <br />
i need a link or more information to find a good entry point to my research
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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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Is it based any criteria, patterns or just mere content of the blocked site which is the reason for blocking .
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Is it based any criteria, patterns or just mere content of the blocked site which is the reason for blocking .

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

Phishing

Twitter is an online social networking service that enables users to send and read short 140-character messages called "tweets". Users can group posts together by topic or type by use of hashtags – words or phrases prefixed with a "#" sign. Similarly, the "@" sign followed by a username is used for mentioning or replying to other users. Users access Twitter through the website interface, SMS, or mobile device app. The Twitter Web interface uses the Ruby on Rails framework. The service's application programming interface (API) allows other web services and applications to integrate with Twitter.