Where are all my friends?

I was creating a list of the people I want to invite to my birthday party and I realised that I don't have that many names like I had expected. I have left out some people who do not attend parties, some who I don't wish to see and some who I think will not turn up even if I have invited him/her. After leaving out these people, I am left with only about 20 names. That is a far cry from the number of contacts I have on MSN. It was only then that I realised that I haven't been keeping in touch with a lot of people. I think it is time to catch up with old friends.