Unfortunately no. We’ve done hundreds of tests and having more fields dramatically kills conversion rate.
Causing people to stop and think will not allow your giveaway to become viral.
You can edit your confirmation e-mail template with a question or link to a form though.
The only extra information we allow you to collect through the giveaway itself is the user’s Name. If you choose to enable that, just head to Kingsumo Giveaways > Options > Settings tab, then click the checkbox next to “Ask for name”. Easy peasy! 🙂