Off the cuff:
as microformats diffuse throughout the web, malevolent uses will inevitably rise.
if you imagine that microformats allow you to use the web as a database or as a file store, you can begin to see the parallels to the malware, spyware and viruses that have wreaked havoc upon every operating system and storage device that there ever has been.
thus it will become important, perhaps at some later juncture, to consider the importance of fighting microspam in the microformatted ecosystem.
i don’t know how, i don’t know what that fight will necessarily look like, but i do know that it’s coming and that we ought be ready when it comes.
to this day, humans have not irradicated the common cold. nor is it likely that they’ll prevent or end the onslaught of a contagion like spam. thus as with the great potential that the lowercase semantic web brings, it is also our responsibility and charge to begin to think about how we might prevent its abuse.