I've been on a few forums, and people just have things happen, and vanish. You never know what's going in - pregnancies, sicknesses, job changes, rough patches in life, falling in love and losing touch with all important fish life, new jobs, etc. For better or worse, our circumstances change and a lot of good voices wander off. Online life is no substitute for real community where you still meet people even if the narrow focus that brought you together changes. I keep in touch with friends I made in aquarium clubs that meet in person, even if they no longer keep fish. But here, we meet around one subject.