1. The person is a long time DW user and doesn't use tumblr. Thus, my DW post becomes a place to talk about something that exists on tumblr. In this case, the post on tumblr is always meta: fandom meta, writing meta, media meta, etc.
2. The post on tumblr invites personal responses and/or long discussions that are better suited to DW's format. I often dual post those kinds of things with a public version on tumblr and a friends locked version on DW.
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1. The person is a long time DW user and doesn't use tumblr. Thus, my DW post becomes a place to talk about something that exists on tumblr. In this case, the post on tumblr is always meta: fandom meta, writing meta, media meta, etc.
2. The post on tumblr invites personal responses and/or long discussions that are better suited to DW's format. I often dual post those kinds of things with a public version on tumblr and a friends locked version on DW.