I've been looking through the members of my site and I find that some are toggled OFF (Active switch is turned OFF). Is this something the member themselves did or some sort of spam detection the site discovered? How does a member's account get toggled off?
Is there a sort of account audit tool that is available to admin? For instance, a tool that can check to see if the email address has been used to spam other sites (antispam, akismet, stopforumspam) and a simple IP traceroute?
The Antispam module blocks the spam content, it is described in its tool. But most probably those members have changed their emails and in your Studio->Dashboard->Settings->Account auto-activation is disabled. In this case, the profile will be deactivated.