Thank you for being here. I'm very interested to hear about the AI work you're doing to track down malicious content and so forth. I'm interested more particularly in tracking the provenance of such content. I submit that anonymity can be a big problem in encouraging bad behaviour online. I understand that Google has a very broad universe in which it operates. It has many different products.
I'm most particularly interested in commentary. I'm wondering whether Google has considered not necessarily requiring users to be authenticated, whether by an authentication authority such as Verisign or by more homegrown approaches such as webs of trust like PGP...and identifying people with an icon of some kind to indicate whether or not these people are authenticated. The next part of that would be to allow them to filter out content that came from unauthenticated sources. Do you have any comments on that?