lj_userdoc, a new feature of LJ allows you to filter for Personal, Communities/Shared & Syndicated Journals?show=journaltype on friends/friendsfriends pages
There's a new option, described in this Zilla bug, that you can add to your Friends or friendsfriends page URL to get all personal journals or all communities.
e.g. http://www.livejournal.com/exampleusername/friends?show=P
shows personal journals
and http://www.livejournal.com/exampleusername/friends?show=C
shows communities. Including shared journals and the News journal.
and http://www.livejournal.com/exampleusername/friends?show=Y
shows syndicated accounts.
You can also combine them:
?show=PC shows personal, community, shared, news journals
?show=PY shows personal and syndicated
?show=CY shows syndicated, community, shared, news journals
?show=PCY shows everything. mainly useless.
