Should there be a minimum transaction limit to prevent dust spam?

Question

With all these reports of people receiving spam through dust transactions (e.g. Enjoy Sotchi, Bitwars etc) what would be the implications of setting a minimum transaction amount on the network? Why would anybody wish to send 1 Satoshi (0.00000001 BTC) it seems to have almost no economic benefit? Would such a limit disrupt any legitimate activity on the network?

Answer 1

There already is a limit of 5460 satoshi. It's unlikely any transaction smaller than this will be ever relayed or included in a block without colluding with a miner.

https://github.com/bitcoin/bitcoin/blob/b78d1cdf82fb12cc0c8eb9049074b359b9589b7c/src/core.h#L153