Chocolate given on February the 14th can have many meanings... They can be a form of love letter... A kind of insurance, or even bribe, to ensure continuity of good relations...
And then...
There's the kind that I've got my eye on... ...it might call itself "chocolate" and it might taste sweet...but it's more like a bomb.
Chocolate gifting on the 14th b/c of love, courtesy, or social obligation, is a popular custom.