You can connect your Google account, Facebook account and broker account, in addition to having a primary email associated with screener.
To link multiple accounts, from the drop-down menu at the top right, click on Settings. You can then click 'Connect' to link the account of your choice to screener
Note: If the email ID linked to your broker account and the email ID linked to your Facebook account are different, this would lead to the creation of 2 separate accounts.
To avoid this, login to screener with one primary account and connect other accounts by following the above steps