The Last Active date indicates the last date that a member accessed the platform while logged in. The Last Viewed date indicates the last date that a member viewed a post in the platform.
There can be cases when a member receives an email (such as a broadcast or digest) that contains a link to a public post. If the member clicks that link, we record a Post View and update the Last Viewed date.
However, if that user wasn't logged in or the post is an external link that isn't hosted on our platform, the Last Active date will not be updated.