I'd say to go for it.
If he doesn't already know make it clear that there is no romantic interest there, and obviously be careful not just by meeting in a busy public place but also watching out not to go anywhere alone with him, being careful if using transport with him, keep purse close, make sure he doesn't follow you when you head home, etc. Maybe have a friend or family member close by just in case you don't feel safe with him or to offer a social buffer if things don't go very well at first - also maybe think of where you could go, somewhere where you can do something fun or interesting but where you'd still be able to chat.
I've met a fair few people in person who I'd originally met online, not for a good few years though as my online socialising seems to have been killed by Facebook. I've met two of my ex-boyfriends online, and several friends, going from online chatting to real-life meeting did make the friendship more real and a lot more beneficial, not all people you meet online are weirdo's after all.
_________________
Bloodheart
Good-looking girls break hearts, and goodhearted girls mend them.