If you mean "rat someone", as in catch them in a act of something undesirable then yes, you can.
An example:
A member of law enforcement finds a black market online. To "rat out" a number of offenders all he has to is post a link to a third party site disguised as a tight deal on firearms or some such item. The site could really be a police web-bot that reads the IP address of all computers that connect and possibly downloading keyloggers to the same computers.
This could count as ratting someone with a link.
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