Question for the webmaster and authors of this site.
I'll do my best to help :)
To what degree is logging kept on your server?
Regular logging is used to measure traffic using Google Analytics and there's also server logs which is more for my debugging / diagnostic use and also to help detect and prevent abuse (e.g. Denial of Service attacks, rogue bots & scrapers etc...)
Has there been any consideration to move the server/host to for example the Netherlands or Iceland etc for added privacy rather than a U.S. based host such as is the case now (currently in Mountain View, CA)?
No, I think it's pointless and is an imaginary veneer of security to be honest imagining that the US government (I presume?) couldn't get your data anyway or that the WTS couldn't take action in any country. It's hosted with Google and they have a pretty good reputation. Any sensitive content is encrypted and the next version will use SSL / HTTPS throughout so all communication to and from the site will be encrypted as well.
Any thought on allowing users to tag other users (e.g. @SomeUserHandle) and have this ping the user either by email, pm or a toast notification (this would be handy to me)?
Yes, I've been looking into this very thing. I also want to provide more of a 'dashboard' where you'll be able to see new and interesting topics based on things you and others have liked, things where you have been mentioned and topics you have taken part in that have been updated. More customized views to give you what you most likely want, faster.
May apologies if these questions have been addressed before...yeah I was lazy and didn't search
Be clear site works great just a few thoughts that might take it even more next level.
No worries, I'm always happy to get feedback and feature requests!
Depending on other projects I have to spend time on (boo to real work!) I'm hoping to get a major new update out in the next 2-3 months which should be faster and slicker and make adding more new features in future much easier.