Log-out without Link provided, is closing browser equivalent?

Most sites provide a log-out link on any of their pages. In some sites, after logging-in and surfing through their pages, there is no log-out link provided. I have called them, and they tell me that closing my browser is equivalent to logging-out. Is this true, or am I exposing the data I entered to others that... show more Most sites provide a log-out link on any of their pages.
In some sites, after logging-in and surfing through their pages, there is no log-out link provided.
I have called them, and they tell me that closing my browser is equivalent to logging-out.
Is this true, or am I exposing the data I entered to others that find the site open?
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