You forgot to mention it's also for single old people past their 40s who have no friends or kids to talk to anymore or for parents who want to look at the half naked pictures of young studs and sluts their sons/daughters have as friends.
It must be hard for you because you seem to focus on the negative most the time.
I am an old person who is well past his 40's. I have a wife, children, grandchildren, extended family and a fair number of real life friends as well as some Internet friends talk to. It is rare that I feel left out or lonely. However, one must cultivate friendships or they may end up mostly alone. When I retired three years ago, I knew my life would change because when one works there is at least eight hours a day where you are around other people socializing, usually more if you get involved in after work events. Fortunately, I had many varied interests which continued after I retired. In some cases because I am no longer committed to a 40 hr. work week, I have more time to pursue those things. I am politically involved, a labor and union activist and I am an officer for a couple of non-profit organizations.
Luckily, some of my friends and I have been friends for most of our lives. On the other hand, there are friends where we drifted apart because of changes in life circumstances like divorces, moving and even death. I don't feel like I have the same ambition I did when I was young to make new friends. And truthfully, Internet friends have somewhat filled this gap.
We live in a time when long distance communication is easy, largely because of the Internet and programs like Skype. My son and his family live in Europe. If it weren't for the Internet and the ease of phone calls, we wouldn't be able to be as connected with them as we are. The same is true with our daughter and her family who presently reside in El Paso, TX. My oldest friend, Gary lives in L.A. We only get together about once every year, but we talk on the phone at least every two weeks and we email back and forth everyday. Actually, because of the Internet and even Facebook, my connections with my large extended family who live all over the world is better then it was prior to having easy access via the Internet. My wife is less computer savvy and spends less time on the Internet. Mainly she just uses email to communicate with friends and family who live at a distance.