Is it normal he stalked my location (or possibly pretended to?)

I met a guy from my uni when we were both out at a cocktail bar. We chatted, he added me and my friend on facebook and started messaging me. The first time he IMed me on Facebook chat, he wanted to come round and chill or something (not unusual as we're all students etc) and he joked like "I'm gunna come over and slap your face" (for something cheeky i'd said) and then was like "I do actually know where you live you know." I'm friends with his ex so I didn't think that much of it immediately but when I asked him how he said that with his degree (electronic engineering) he could find where anyone was as long as they are connected to the internet, by using key logging, but that it was hard and the person had to be connected at the same time as he was tracking them. He only said this after I was asking loads about it cuz it kind of freaked me out.

So is this possible? I later realised that I'd already told him where I live so I'm not even sure that he didn't make it up to sound impressive or something weird (my friend has known him since the start of uni and says he boasts quite alot). If it possible it's quite freaky. Or did he make it up? Would he be able to do that? And if he did do it and wasn't just kind of joking cuz I'd already told him where I lived then isn't that kind of creepy and stalky?