...human trafficking is prevented.
If you have about a half hour, read the whole linked thread from top to bottom. It is an amazing story, better than anything you will see on a detective show. Because it really happened today.
The link goes to a thread on a web forum called MetaFilter, specifically the AskMetaFilter section, where someone asks how to help Russian friends that are in danger of falling victim to a human trafficking scam on the East Coast of the U.S., while the person trying to help them is in the Rocky Mountains.
It's amazing what can happen when people reach out to help.
This is perhaps the best use of the web. Ever.