Hi Buddhapi! How specifically do you do block their robots, for those that are not very computer savvy? I've also read one can enter code that in theory should block robots, but in reality they don't. These robots just ignore them. Have you heard this too? I'll give it shot though if you, or someone on this forum, can give specific instructions (or guide someone where they can locate such instructions) as to how to enter the blocking code.
Also, I'm aware one can enter code so Google doesn't take screen shots, but does that in any way affect a company's ranking as far as how high up a company appears in Google search results? I am not clear on that.
google's ,domaintools & archive.org bots/spiders do adhere to robots.txt, see the previous post for directions.
This will have no effect no your current rankings, as the pages will still be indexed, my main site still sits in the #1 position under multiple search terms.
In regards to GI /Picscout, this robot does not following robots.txt guidelines, and actually disguises itself as a regular user, I'm currently looking into whether there may be a legal issue here, my take on it is if I am giving specific instructions to block certain robots/spiders and they skirt these directions it's borderline hacking, not only are they in effect trespassing, they are also stealing my bandwidth and server resources. There are a few tricks that can aide in blocking picscout, if you are interested, please send me a PM, as this is not something i want to post openly.