The photo on the left uploaded by @yanta shows Dear John letters being slipped into boxes of chocolate in a supermarket. On the right, the photo shows one of the letters reading"let's break up. The chocolate will be my last present for you." [Photo/weibo]

Valentine's Day is known worldwide as a time to celebrate love and romance. But the upcoming holiday is also notorious for reminding many "singletons"of their lack of a significant other.

Instead of moping and feeling left out, many Chinese singles decided to join each other in a crusade against the love birds — proof that the singles are not alone in the festival after all.

Here is some advice posted online by some love-starved online activists on how to sabotage Valentine's Day for those lovey-dovey dates:

Buy up the odd-numbered seats for movies so the cooing lovers can't sit together.

Book up all double rooms in hotels so the lovers will have no place to spend the night.

Crumb chocolate and puncture condoms in supermarkets.

Walk up to a couple on the street, slapping either of them in the face and crying out "How could you cheat on me?!" (Better if this happens between the same sex).

Take a part-time job to deliver flowers and throw half the bouquets away.

Some of the pranks have been put into practice. Sina Weibo user @Yanta uploaded one photo showing him (or her) slipping Dear John letters into boxes of chocolate in a supermarket. The other photo shows one of the letters reading"let's break up. The chocolate will be my last present for you."

A café in Luzhou, Sichuan province announced proudly in its Weibo account that couples are not welcome on Valentine's Day, while singles will receive a 10 percent discount in the shop.