Yes I've read about this too. You're supposed to massage the breast hard enough "break up" this fiberous tissue that wants to form around the implant. After all, it's a foreign object in the body, and the body is natually going to try to protect itself from it, or reject it, unless pulverized into accepting it.
As for the wrinkle or fold lines, Pandora Peaks has this bad and I always attributed it to the foreign object (the implant) hanging like a dead weight inside the skin of the breast. Unlike with a natural breast, which is weighted with connective tissues and glands and what-not, pushing and pulling but evenly connected and part of the body. So natural sagging may cause stretch marks, or other aethetically unpleasant sights, but not the kind of stress lines (wrinkles, folds) caused by having a heavy orb inside the breast pulling it to earth.