In Korea, there's 3 days: Black Day, where you celebrate being single by going to a chinese restaurant and ordering the black bean sauce noodles. Lots of people follow this tradition, so despite not getting chocolate or a significant other, you're never lonely on that day, whether with friends or making new ones.
I still think if singles want to celebrate Valentines ironically (or this Black Day), what we REALLY need to do is secretly snicker behind the backs of couples with greedy, uncontrollable, misbehaving kids that clearly didn't want them. And the fact that half the time the mother looks like she was the high school...erhhherm... and now she's starting to become a slubby, sweatsuit wearing, genderless blob... you know the girls that treated everyone terribly. Not to mention the knuckleheads that just randomly grab stuff at 5 PM to try to make it look like they didn't forget.
In other words, don't feel that you're sad that you're single... laugh at the mild misfortune of those who are. Not to their faces, of course. That's rude.
Sounds mean, but the ones that really hit it off and are in great relationships laugh at those who are single and lonely on those days.