One if the best ways to increase sales is to utilize each and every event that translates in purchases from your potential customers. Which is why, Valentine's Day is one such day when with a simple contest you will not just manage to increase your sales but also help win a lot of love from your fans.
One of the best contests that can to hosted on your timeline itself on Facebook is the video or photo contest where by you ask your fans to post pictures of themselves with their valentines, be it their pets, their kids o their friends and family; and go on to select the best photo.
You can also ask them for craft or decoration photos and the one with the best decor wins.