Stackoverflow has no "inbox" for users, yet in some circles (uncommon or new languages, specific topics) there are very few "experts" and some important questions get passed over as a result. Is there any way to reach out to an "expert" (someone who has answered a question very well in a field related to the poster's question) without violating Stackoverflow rules like
1) Do not comment on one question asking a specific user to look at another question
2) Do not answer one question with a request for a specific user to look at another question?
Why has a messaging inbox not been implemented?