yes, when you edit a post in the web site you can control its accessibility.

You can set a posts visibiltity to Show or Hide. A hidden post will not be displayed to others. Only you can see it.

You can set a post to be "Available To" only Friends or Everyone. So, if you set its visibility to Friends, on other WildVoice users who are your friends will be able to see it.

See this forum post for similar info.