I'm seeing this more in my travels lately. In Paris for instance two of the bridges had solid walls of these locks in sections. I wonder how it started. Was there some movie or pop song or music video? I feel like I'm an old man out of the loop on popular culture. Oh, wait... I AM an old man out of the loop.
"Love padlocks have existed for quite some time, though there are no certain sources for their origin. In Europe, love padlocks started appearing in the early 2000s. The reasons love padlocks started to appear vary between locations, and in many instances are unsourced. However, in Rome, the ritual of affixing love padlocks to the bridge Ponte Milvio can be attributed to the book I Want You by Italian author Federico Moccia, who later made it into the film-adaptation Ho voglia di te."
http://en.wikipedia.org/wiki/Love_padlocks
"Love padlocks have existed for quite some time, though there are no certain sources for their origin. In Europe, love padlocks started appearing in the early 2000s. The reasons love padlocks started to appear vary between locations, and in many instances are unsourced. However, in Rome, the ritual of affixing love padlocks to the bridge Ponte Milvio can be attributed to the book I Want You by Italian author Federico Moccia, who later made it into the film-adaptation Ho voglia di te."