Tell him you need more time to get to know him BETTER. Maybe phone calls to hear his voice, and live video chat, if you can, not just photos that can be faked or touched up, etc. Dont just go out there like a chicken with its head cut off lol. Get schooled on this guy first, then decide. If he is not satisfied with that, then he has something to hide and should definitely be avoided! And if all goes well with the get to know you better stuff, go and have fun and be safe, always wise. Blind dates are just not practical this day in age. Better to be safe than sorry : )
Get to know him better if you're interested. I think that phone conversations can tell a lot about a person, from their sense of humor to their use of language. If you do decide to meet, do so in a well populated public place, like a restaurant or the zoo. Make sure people know where you are and maybe even have a phone call check-in during your date to see how things are going, or if you need an excuse to leave. Internet dating is fine as long as you are smart and careful about it. I met my fiancée on a social network!