Apparently there is a person/group going around and hacking the Moderator accounts of large LJ communities. After hacking the Mod's journal, they go to the community and make a post with malicious links, disable comments, and delete all content from the community & mod's journal.
This is an example of a post from a community that was recently hacked. If you see anything suspicious, don't click on any links and contact me by PM.
Thanks,
KTG