That was my impression, too. I saw their group as a small off-shoot of this one. I think it's great when people share interests and find a way to grow from there.
As for posting, there are a lot of people who just don't have time to come regularly. I try to pop in at least every couple of days but it's hard to keep up. I do much more "lurking" than posting as a result. I think we all understand "life happens" and people will always be welcome to come back when they can.
Now that we're doing the Big Gives, I think it's definitely worth encouraging people to stay involved at whatever level they can. Even if people can't keep up with this thread, I really hope everyone who posts or lurks here from time to time will consider participating in future Big Gives. I honestly have to say it's been such an amazing inspiration to me and I hope others will feel the same so we can continue to Give with the same enthusiasm.