turns out I lied to you 🙃 You can enable the questions box in your profile settings; however, only authenticated users can ask you questions! so neospring is the anonymous-Q&A site.. and tetratto just happens to have questions as a side feature

(they were really only added for qotd communities, but there's no point in doing that without your profile too since it's fairly easy to implement)

probably not, although maybe some guestbook-y things… like some sort of field in posts where you can post them to other profiles (which have it enabled.. and at the review of the person you’re posting too as well)