I have and though it feels a bit shit at first, I feel better in the long run. I am not willing to constantly be the instigator whether for me or for my children to meet with their children.
Two school mum friends - were happy to catch up when I contacted them. I mentioned meeting up and they left as is. I contacted them again and have left it - four months have passed.
Another friend happily responded to my "how are you" and "it would be nice to meet up" messages but never contacted me off of her own back. I ceased contacting her and over a year has passed.