DW (and LJ and IJ before it) are Tumblr without the algorithms throwing content at you: you have to find the content yourself. Which is work, yes, but also means you have a lot more control over what you see and who sees you. There are pros and cons to each. I think Tumblr is easier when you're new to a fandom; the interactions are shallow but broad, which is what you want until you find your tribe(s). But DW is much better for real conversations rather than standing on a rooftop and shouting to all and sundry. Assuming that's what you want, of course.
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Welcome to online fandom v2.0.