this isn't wp.com specific, as much as it is akismet-specific.
If i'm getting pingbacks from blogscrapers, should i mark the comments as spam? technically, they're valid pingbacks, from real sites... but the content is identical to the previous pingback. Is this something akismet can learn, or should i just keep deleting the pingbacks?
(obviously not the most ethical sites in either case, i'm tempted to just spam them both)