I use LinkedIn as my resume, business card, and professional contact list. However, LinkedIn does not allow me to take an effective action based on my contact list. For example, I often get a reply from a person I contact through LinkedIn a couple months later because they did not notice they've received my message. They also charge a lot of monthly fee just to be able to send out couple messages, and I feel like it's discouraging 'networking' activities after you exchange your business card.