Gleam allows you to connect your Bit.ly account to the Viral Share action type as an integration. This means that any Viral Shares that happen will go out via your Bitly account (which you can track).
You can enable Bit.ly Integration on the Business Plan & above. Simply navigate to Settings > Integrations then turn on Bit.ly
You will need to connect and authorize your Bit.ly account.
Once Bitly is integrated you'll start to see the share links are now shortening via your Bit.ly account.
Please note that we cache these links, so if you viewed the Viral Share before you activated Bit.ly you will need to test incognito.