TIgor4eg

This plugin takes tweets from public profile and posts to VK.com(VKontekte).
Plugin stores last 50 tweets. New tweets are checked every 10 minytes (depends on WP-Cron) and every time you visit settings page. All links appear unshorted. First link in tweet is parsed as attachement to VK Wall post. Twitter usernames will appear as a link to twitter profile.

Twi2VK

This plugin posts twitter statuses to VK.com

etspring

NEW: Supports built-in WordPress comments threading! [see notes 2 and 3]
Automatically synchronizes comments from Your LiveJournal blog with Your stand-alone WordPress-based blog.
All imported comments are associated with Your blog entries, crossposted to LiveJournal, and shown along with comments, written in You blog.
You can choose how often do the synchronization.
Synchronization does not slow down loading of Your pages, everything is done in background.
Note 1: This plugin has to be used together with LJXP (LiveJournal CrossPoster) plugin. Support of JournalPress and other crossposters will come in future versions (please feel free to post feature requests at the plugin homepage).
Note 2: Threading depth is limited by WordPress settings (<code>Settings - Discussion</code>).
Note 3: You should consider removing <code>Reply</code> link for imported comments, because they are not really a part of WordPress :).

LJ comments import: reloaded

Automatically synchronizes comments from Your LiveJournal blog with Your stand-alone Wordpress-based blog.

Twi2VK vs LJ comments import: reloaded