Just curious, what do you use for fandom nowadays?
I don't. I geek out over various things, one or two other people appear to geek out along with me, and that's all I need.

Which is why you won't see me blogging about web serials anymore, because clearly, no one on my f'list cares.

Given this....what is your take on LJ's dwindled popularity?
See above. I geek out either with one or two other people, or in a vacuum. It's always been that way with me.