Of bridges and locks

On one of the many bridges that connect the two sides of Paris lies a bridge where for some unknown reason people have hung locks. There doesn't seem to be any rhyme or reason, it just is because it is. Some of the locks carry love dedications, others have flags of where people are from and others are just blank. Looking at them all together is cool if not a little puzzeling.  What they are meant to represent I am not sure, decided for yourself.