Who you gonna ask?
While the phrase "wildly famous" may not apply to the Oracle ACE program members listed here, each has their own following, and each has earned a reputation for sharing experience and expertise. And let's face it, if you have a question about Oracle APEX, or about Autonomous Transaction Processing, are you going to ask one of the Kardashians? I don't think so.
Better you should ask one of these people, or read one of their freshly-written articles.