If you put a phone booth on the street in front of your house or business, like a free phone booth, are you liable for the contents of the calls placed on it? W

If you put a phone booth on the street in front of your house or business, like a free phone booth, are you liable for the contents of the calls placed on it? What if there were two phones? A hundred? What if it wasn't a phone but a mailbox? A big chalk board? A bulletin board? What if it weren't a mailbox but a free parking lot? Bob could put a thumb drive in his glove compartment, park his car, and then have Alice pick it up. Am I liable for what's on that drive because I provided free parking that was used as a medium for illegal information? That why I think sharing things with strangers cannot logically make you liable for their speech and information. Having a free-to-use shotgun and a box of shells in front of your house is an entirely different question. That's why I said the analogy was a poor one.