God made introverts and extroverts and we need each other! Your group will probably have a pretty even mix. In-person groups are challenged to honor both, but online platforms seem to draw out extroverts and allow introverts to recede. Keep this from happening with a few guidelines.

Up Front
Explain at the start of the group that since the group platforms allow only one person to speak at a time you will facilitate the conversation in a manner more structured than a typical small group that meets in a living room.
Facilitate
Ask specific questions of specific people. If you start with the introvert, then open it up to everyone else the extroverts will take their turn.
Batter Up
If you have many questions to work through, consider creating an order like a batting line up in baseball and work through the lineup.
Flag
Ask members to raise their hands to flag (yes, you can even do this online) and call on specific people. You can still call on your introverts – even if they don’t raise their hands.
Edit
Cut short the “rabbit trails.” Off-topic observations are a favorite pastime of many extroverts so halting them politely and quickly will help keep extroverts from dominating.
Look
Take note of who is not sharing and invite them into the conversation.
Draw Out
Be an assertive leader without dominating yourself. Avoid monologues and lectures and think of yourself as a facilitator of dialogue that gets better the more people are involved.