I have somewhat conflicting views about this. On one hand I think that twitter users should be able to prevent the service from mirroring their accounts if th

I have somewhat conflicting views about this. On one hand I think that twitter users should be able to prevent the service from mirroring their accounts if they want to. Which would be technically difficult, and, since everyone would probably act on it if presented with the option, it would make the service mostly useless. On the other hand they posted public messages on twitter. This service provides a slightly more specialized type of indexing from a search engine, so content should be fair game.