Private profiles
It's tricky adding someone when you don't know anything about them. How would you know if you have any common interests? If you're wanting people to add you on skype you should consider creating a description of your interests and what your looking for if your profile is private. I see a few requests from time to time with no info.
That and also those who don't have any or no pics - as myself. I had a few pics and some information but one day I couldn't log in, my profile had disappeared. For a few weeks after there was as if I had never registered. I left it alone for awhile, then went back in re-registered with exact the information originally, got a formed email welcome back and got a location from the system that wasn't mine, no pics. Thought okay let well enough alone. So now no pics, no information about myself, let the system or whoever do as they please. Make friends on here and from there if someone is interested we can give our own information to that person only. End of RANT.