I organize a business group online and am trying to think of provocative questions to ask to jumpstart discussion. Any ideas?

The group mainly consists of entrepreneurs and investors, plus some academics (researchers and professors). They’re interested in things like investing, taxes, new technology and product/business ideas, marketing, market research, controlling costs, etc. We have a few new people join each day, and besides saying “Welcome Bob! Please share a bit about yourself” I’m wondering if there’s a better, more stimulating question I could be asking – not necessarily “What’s your favorite color?” or “Where have you lived/worked in the past” but along those lines. Anyone have creative/timely ideas? Thank you!