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

kei51

This plugin allows you to crosspost your entries to both your wordpress and mixi at the same time. Mixi is one of the most popular SNS sites in Japan.
Once you install this plugin, you will see the option in the edit screen. If you want to publish your post to mixi, you can simply check the option and publish.
You can find the Japanese description at <a href="http://ksnn.com/diary/?page_id=2437" rel="nofollow ugc">here</a>.

publishToMixi

This plugin allows you to crosspost your entries to mixi.

Twi2VK vs publishToMixi