I marked this as sticky, for a few days. We've had a feature suggestion post before, but it generally gets way off course on either really site-specific requests or unreasonable/impossible requests.
As for your specific notes, there's always more extensions we could support. We have a few ideas on how to improve our breadth of extensions that we integrate with. First, our next release, v4.3, will be adding a plugin based system for Open Graph descriptive tags and Open Graph actions. We'll be releasing some plugins to add these description tags (like we do for Content and K2 already) as well as for some other extensions. Ideally, our system will be easy enough to use that other developers will create their own plugins as well.
For our next major release, v5.0 (early next year), we're revamping the profile plugin system to ease development and hopefully make it easier for both us and other developers to create profile plugins as well.
We plan to keep allowing our extensions to be extended through plugins in this way in the future and grow our overall ecosystem. There's a lot of great devs we're already chatting with behind the scenes and hope to have some good announcements over the next few months.
With all that said, Zoo isn't currently being investigated. We have gotten a good amount of requests for Zoo support though, and if we don't have an Open Graph plugin available right away, I can definitely see coming up with one after v4.3 is available.
For statistics, the Open Graph Actions will have an activity log area in the admin section logging all actions that have occurred ("John read article 'x'"), etc. That will only work for Facebook users and won't cover all actions (Like and Comment won't be tracked, for instance), but it's a start. Commenting is difficult as we don't currently 'see' what comments a user has made or store them in the database. We'd love to add that feature in a future release, but don't have a timeline on it.
Hope that helps explain, and, as always, your feedback and/or suggestions are welcome!
Thanks,
Alex