How can I contact people in Mexico using the internet?

www.google.com.mx

ask dr_C on fluther. He lives there.

Generally marketing a product in another country involves “localizing”—redoing your advertising materials in the language of the target country and taking into account the cultural differences of said country.

craigslist for Mexico might be helpful!

I would stay away, there are already three main cartels in Mexico promoting their product. :)

Great answers so far. You all have helped a lot. I sent a message to Dr_C. That Craigslist & google Mexico was excellent, Thanks!

Which US state(s) has the largest concentration of Mexicans? Figure I would target that location with my advertising. The same with the below.
Which Brooklyn, NY and Manhattan, NY neighborhood has the most Mexican populous?

what are you selling?
[I doubt the cartels are any competition]

It’s a program for current TelCel wireless customers that enables them to pay only $0.10 cents for the first 90 mins of the call to/from the US, Canada and Mexico from their cell phone.