Places meta tags in your blog's header, so a suitable image and description show, when crossposting to Facebook or generating a Twitter Card.
Plugin for Auto crossposting your new WordPress posts to wall on your "public page" on VK.com. With Attached Image, tags and link.
Crosspost blog entries to LiveJournal automatically or on a post by post basis. Crosspostable options include user pic, current music, current mood, s
A cross-poster supporting multiple LiveJournal Server journals.
Automatically, cross-posting to assiciated site/blog to enabling the post-via-email option with PIN code e.g. multiply.com, livejournal.com, blogspot.
Croissanga is a WordPress plugin that gives you the ability to add, edit, and delete your Xanga posts directly from WordPress.