It was the other way around -- after LJ was sold to SixApart, it started changing in ways that fandom saw as hostile to continuing to stay, and the slow mass exodus began around the time of the Strikethrough debacle. Strikethrough was in 2007, and Tumblr didn't really take over as the main fandom platform until 2011-2012.
Why fandom chose Tumblr as its new home rather than Dreamwidth (which is basically just LJ, designed with fandom in mind, without the evil corporate overlords) has always baffled me a little bit, but that's where they went, and that's where they stay.
To my mind, the end of fic announcement comms was caused by death of Delicious. Most of the newsletter comms I'm familiar with depended on Delicious to aggregate their links, and when Delicious changed format drastically, it became much harder to use as a back end.
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Why fandom chose Tumblr as its new home rather than Dreamwidth (which is basically just LJ, designed with fandom in mind, without the evil corporate overlords) has always baffled me a little bit, but that's where they went, and that's where they stay.
To my mind, the end of fic announcement comms was caused by death of Delicious. Most of the newsletter comms I'm familiar with depended on Delicious to aggregate their links, and when Delicious changed format drastically, it became much harder to use as a back end.