This could be to fool people into thinking you are in one location when you are in fact in a different location close by.
You might also do this to appear cool on facebook by checking into exciting sounding locations. It allows a person to 'check into' a bar or club near where they live, when they are in fact at home in bed.
You might also check in whilst in a car.... driving past a location. hence the definition of drive by check-in
B. No i'm actually at the home.... did a cheeky check in at Sonic on my way past!
A. HAHA a drive by check-in you sly dog!