This is a bug on Friendster's new feed style.
As you may have noticed, Friendster not too long ago changed its newsfeed style and made it look more like Facebook. The problem with this new look is that private photo thumbnails are still appearing in the feeds. When you click on the thumbnails, you can access the photos themselves but not the entire album. The album itself and the other photos remain private.
I'm sure Friendster will be aware of this bug soon enough if they aren't already. But for the meantime, please tell your friends to stop uploading private photos until this is fixed.