SOL= Smile Out Loud
Often used by realist Social Network-ers who want to be told the truth, not that another person is laughing when they're actually smiling or doing something else with their mouth.
Note: Never use incorrectly, for example, do not say SOL if you are laughing, frowning or doing something else with your mouth.
A:OMA DAIZ I LIKE REALLY LIKE YOU
A: LOL, jokes guy (whilst smiling)
B: Say SOL you lying piece of poo.