The voter list shows the full list of people who voted on a post.
To access the full voter list, just expand the preview you see on the post menu:
This will take you to the full list of voters for that post. The arrows in this image are explained just below:
You can filter the list by user segments you've created via the bar at the top.
If a vote was added on the voter's behalf, it can be removed by clicking the X. (This option will not appear if the person voted on their own behalf).
If you want to download the list to a CSV (spreadsheet file), simply click the "Export List" button at the bottom left of the list.
Opportunities link potential revenue based on HubSpot deals and Salesforce opportunities.
Opportunities (called "Deals" in HubSpot) are usually related to ongoing contracts. The opportunity's value usually indicates new revenue that your team has the chance to unlock.