Jeremy Herve

Extends the Jetpack plugin and allows you to add a Vk.com sharing button to the list of sharing services available under Settings > Sharing in your dashboard.
Important: for this plugin to work, you must activate <a href="https://wordpress.org/plugins/jetpack/" rel="ugc">Jetpack</a> first, and activate the Sharing module.
If you find issues, you can report them <a href="https://wordpress.org/plugins/vk-sharing-jetpack/" rel="ugc">here</a>, or submit a pull request <a href="https://github.com/jeherve/vk-sharing-jetpack/" rel="nofollow ugc">on GitHub</a>.
Note: Once you’ve added the button under Settings > Sharing, it won’t appear on that page. Save your changes, and look at one of your posts to see the button in action.

Vk.com sharing for Jetpack

Add a Vk.com sharing button to the Jetpack Sharing module

igrp

VK Lock make is possible to restrict page\post access to authorized VKontakte group members only. 
Plugin will take care about site visitor authorization in VKontakte and checking if he\she is member of VKontakte group specified by you. 
Access to the protected page\post content will be allowed only if user is authorized and is a group member.
Restriction works for password protected pages\posts only – this means that your have to set page\post type to “password protected” and specify any password (plugin does not use this password, if you like you can access protected page with that password via conditional password access form, provided by WordPress).
Plugin works via VKontakte API (https://oauth.vk.com/authorize) therefore you need to make some proper (its very easy) settings at VK.COM side. See Installation instructions.
This plugin may not work properly with PHP versions earlier than PHP 5.2

VK Lock

Restrict page\post access to authorized VKontakte group members only.

Vk.com sharing for Jetpack vs VK Lock