When you go to your auction page, there is a pic of you. Under that there are a list of bubbles. Under them is a link that says verification. That should take you to where you can find out the info that is needed to get fully verified. It has to phone verify, financial verify, facebook verify, and optional twitter verify. Only takes 5 minutes to do. Then you'll never have to do this again. Doing this also gives bidders a sense of trust and confidence that they aren't being scammed. Need any more info, feel free to ask. I will try my best to help you.
You are fine now. Twitter is not required. Listia just wants to have as many ways to reach you in case of a problem. You won't have to do this again. Now bidders will trust that you are not a scammer and will bid higher. Good luck and I hope you enjoy listia.