As fate would have it, last week I had two guests from the Kallari Cooperative in Ecuador staying at my house while they were meeting with distributors and consumers around Seattle. Farmers at this cooperative not only grow the beans but process them too, cutting costs and enabling themselves to make close to $2.00/lb dried cocoa. They taught me about the bean to bar process and also about the fair trade model itself, actually raising questions about how fair it really is (a debate for another time). For now, we have certifications like fair trade to indicate to consumers that these companies are upholding certain ethical, fair wage principles.
So while flowers and chocolate may show someone your husband/wife/girlfriend/partner/best friend that you are thinking about them, buying fair trade shows that you're thinking of human rights worldwide as well.