i will normally tell these fair weather friends to go hor gao gan....im only grateful to those who has helped me in times of need or lend support when i am down and broken. Not those who realised that you just bought a nice sports car and decided to ask how you are doing for the first time in 5 years
I feel that at the very least, call them up and ask them how are they doing. If they are keen, then initiate a kopi meet just to catch up on old times......sms or whatsapp or fb is just plain meaningless.