Simply the power to make someone, you're talking to online, literally laugh.
Similar to 'lmao' or 'rofl' but can be used to define even a slight loud chuckle as aposed to a full on laugh.
haha, thanks :L jon's taking photos of the bestival for me :L
:L hes selling candy floss ^^:L
i think its sweet... that was the WORSE joke i've ever said :L
haha! i actually Telepalaughed. :L