Sure! I thought about doing that, but wasn't sure... if someone posted in both places then it's kind of spammy for someone reading in both, and there's no way to mirror communities the same way you can with crossposting.

Ultimately I decided on LJ because pretty much everyone on Dth has an LJ, which means there aren't as many issues for having an account to post on, and I created a feed to Dth for people who wanted to read there instead - the closest I could get to mirroring content.