Why would a guy "poke" a girl on Facebook?

freehugs02
this guy and I were really flirty the other night at a party. (side note: he's pretty shy when it comes to girls he could possible date). We talked a little the next day then we stopped for a few days and I figured he wasn't interested. then he sent me a "poke" on Facebook... what does it mean?
Why would a guy "poke" a girl on Facebook?
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