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Better way to prepare comments:
- Allowing some tags
- Generating valid HTML
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Limited thread:
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Add interval to fetch the thread in order to allow paginating
cm->build_thread($comments, $parent_id, $from, $to);
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Test potential interlocking when executing simultaneous query from different users
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Register, user database to prevent identity theft
- Login from external accounts such as Google, Twitter, etc. OpenID?