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.

Amir Candido

Allows you to create multiple-choice question quizzes, like those on the Buzzfeed website.
Allows you to create as many questions as you wish, each with as many picture outcomes as you wish. Each of the picture 
outcomes may or may not be associated with a particular result. Place the quiz in a post or page by pasting in its shortcode.
Users click on picture answer choices, each of which may (or may not) be associated with a final outcome. After the final picture is clicked on, a result is revealed and users can share this on social media networks of their choice.
NB: PLEASE READ README.TXT FILE IN THE THE WP-QUIZR FOLDER FOR DETAILED USAGE INSTRUCTIONS; AND DON’T FORGET TO PROVIDE FEEDBACK. THANKS!
<h3>User Guide</h3>
<ol>
<li>
After installation (as described above in the “Installation” section), go to the Settings page (Settings->Quizr Settings on the left-hand side 
menu) and put in your Facebook App ID and/or Twitter handle. If you don’t provide the IDs, you will be able to create quizzes, but 
your users won’t be able to share their results.
</li>
<li>
Create a new quiz: Quizzes->Add New on the left-hand side menu. Also take note of the quiz shortcode (in the form [wp_quizr id = “xx” columns = “x”]) that’s shown on this 
quiz-edit page; you will need to paste this later on the page or post in which you would like your quiz to be shown.
</li>
<li>
Give your new quiz a name.
</li>
<li>
Specify the number of final outcomes and the number of questions you would like this quiz to have. Click “Publish” so this information is saved. 
The “Titles of Outcomes” and “Titles Of Questions” fields will now be available for your input.
</li>
<li>
Specify the titles of your questions and outcomes. For the question fields you can choose to show your question as both an image and text, or you can show just one of these. You can do this by using the 
“Show Text For This Question?” drop-down menu.
</li>
</ol>
NB: If you choose not to show the question’s text (only an image), please make sure to specify your question title’s text, even though this text will not show on the quiz.
6.Click on “Update” to save this information. You will now be able to upload 
the picture choices for each question and for the outcomes. Note that these fields will not show if the fields above them have not been completed.
<ol>
<li>
Specify the details for each outcome. You can specify the Outcome image, its description as well as a url you may like to direct the user 
to if they click on the image. Each of these is optional.
</li>
<li>
Upload and specify the question images associated with each outcome. You may also choose to have an image that is not associated with any of your 
outcomes by clicking on the plus (+) sign to add an image. The final result depends on the number times the user chooses images associated with that particular outcome.
</li>
<li>
Paste the shortcode (available from the Quiz edit page) in a post or page. Note that if you don’t specify the number of columns in the shortcode, 
the default number of columns (2) will be used.
</li>
</ol>

WP Quizr

Works great

good

Create Buzzfeed-style quizzes and share results on social media.

Super Refer A Friend vs WP Quizr