How can I tell if someone I met online is actually someone I know?

[MissSunshine2]

[Nikki1989]

Ask questions only he or she knows the answer to. They will either answer and hence give themselves away or avoid the question altogether. Both of which suggest you are onto something.

[OneNisa]

Learning this can be difficult; if you're lucky, you'll meet a good person.

[SamIam96]

It sounds like you're thinking that you already know them. If it were me, I'd just ask... "is this whoever?"

[serious]

I suppose you need to ask them the same questions you asked them when online.

[Fl2pa]

Ask him a question only he would know

[NathanDavis]

look for more context...

[lilBigPotato]

Meetup.

[In_Trance]

Ask them