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This feature adds the ability to charge a user $1 (or any amount that you choose), and when payment is received, it shows a “verified” icon next to their username and/or next to the title for any listings the user places. It also shows an icon in the listing details page for any listings placed by a verified account.
This is done as an anti-spam measure, since most spammers are not willing to pay money to spam a site. It is the most useful on sites that offer free listing placement and might get a high quantity of "spam" classifieds or auctions. When a visitor sees that the classified ad was placed by a verified account, it helps to identify that listing as legitimate.
The feature may not be for all sites, particularly sites that either have closed registrations, or sites that "always" charge for listings and as such do not get very many spam listings.
The main capabilities:
You turn this feature on/off in the admin at Site Setup > User Account Settings, in the section Verify Account Settings.
When turned on, you will be able to set 2 different icon URL's in the admin at Site Setup > Browsing Settings (Icons Used in... section).