When a pervert exposed himself on a Manhattan subway last week, Thao Nguyen reached for her secret weapon - her camera phone.

The quick-thinking 22-year-old snapped a shot of the smirking sicko, took it to cops and then posted it on the Internet.

After her campaign to nail the flasher raced through cyberspaceand and also made it to the printed press the hunt was too wide and the pervert finally turned himself in to the police.

Manhattan restaurateur Dan Hoyt, 43, hung his head on the way to Central Booking after he was picked out of a lineup by four women and charged with public lewdness.

“Well he finally turned himself in and hopefully he will get some therapy or counseling to help him stop flashing people.” said Nguyen, “We caught this guy because of you folks. Whether or not you were supportive, I really appreciate everyone who took the time to pass around the image and the story. If it weren’t for you folks, then this man would probably still be out there. I always wanted to make a difference in the world but I didn’t think it would be through this way.”