wplift

Super Refer A Friend is plugin which adds a new widget to your blog which allows readers to email the page they are on to a friend via a popup box. 
They can enter more than one email address and customise the message that is sent. 
The plugin includes a captcha and you can set a mailing limit to prevent spam
Support at http://wplift.com/refer-a-friend-wordpress-plugin

Super Refer A Friend

Creates a widget to send the current page to a friend via email with a message.

evgendob

With this plugin you can create any number of BuzzFeed style Personality Quizzes. Interface is easy and it is mobile friendly. So Just try it!
Features
<ul>
<li>Easy to use interface</li>
<li>Two types of questions</li>
<li>Unlimited number of questions and answers ( <a href="http://codecanyon.net/item/wordpress-buzzfeed-style-quiz-plugin" rel="nofollow ugc">Full Version</a> )</li>
<li>Responsive layout</li>
<li>Ability to customize share message depending to social network ( <a href="http://codecanyon.net/item/wordpress-buzzfeed-style-quiz-plugin" rel="nofollow ugc">Full Version</a> )</li>
<li>Ability to add advertising to quiz results ( <a href="http://codecanyon.net/item/wordpress-buzzfeed-style-quiz-plugin" rel="nofollow ugc">Full Version</a> )</li>
</ul>

WordPress BuzzFeed Style Quizz Lite

With this plugin you can create any number of BuzzFeed style Personality Quizzes. Interface is easy and it is mobile friendly. So Just try it!

Super Refer A Friend vs WordPress BuzzFeed Style Quizz Lite