social plugins

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Facepile

https://developers.facebook.com/docs/reference/plugins/facepile/ The Facepile plugin displays the Facebook profile pictures of users who have connected with your page via a global or custom action, or can also be configured to display users that have signed up for your site. If you want to display users who have connected to your page via an action, specify with the action parameter <fb:facepile href="http://zhen.myfbse.com/rb-roastchicken.html" action="og_recipebox:planning_to_make" width="300" max_rows="1"></fb:facepile>
https://developers.facebook.com/docs/plugins/registration/ Introduction The Registration plugin allows users to easily sign up for your website with their Facebook account. The plugin is a simple iframe that you can drop into your page. When logged into Facebook, users see a form that is pre-filled with their Facebook information where appropriate. The registration plugin gives you the flexibility to ask for additional information which is not available through the Facebook API (e.g. favorite movie).

Registration

Like Box

https://developers.facebook.com/docs/reference/plugins/like-box/ The Like Box is a social plugin that enables Facebook Page owners to attract and gain Likes from their own website. The Like Box enables users to: See how many users already like this Page, and which of their friends like it too Read recent posts from the Page Like the Page with one click, without needing to visit the Page The minimum supported plugin width is 292px. Attributes href - the URL of the Facebook Page for this Like Box width - the width of the plugin in pixels.
https://developers.facebook.com/docs/reference/plugins/recommendations/ The Recommendations Box shows personalized recommendations to your users. Since the content is hosted by Facebook, the plugin can display personalized recommendations whether or not the user has logged into your site. To generate the recommendations, the plugin considers all the social interactions with URLs from your site. For a logged in Facebook user, the plugin will give preference to and highlight objects her friends have interacted with. You must specify a domain for which to show recommendations. The domain is matched exactly, so a plugin with site=facebook.com would not include activity from developers.facebook.com or www.facebook.com.

Recommendations Box

Activity Feed

https://developers.facebook.com/docs/reference/plugins/activity/ The Activity Feed plugin displays the most interesting recent activity taking place on your site. Since the content is hosted by Facebook, the plugin can display personalized content whether or not the user has logged into your site. The activity feed displays stories when users interact with content on your site, such as like , watch , read , play or any custom action . Activity is also displayed when users share content from your site in Facebook or if they comment on a page on your site in the Comments box .
Comments Box is a social plugin that enables user commenting on your site. Features include moderation tools and distribution. Social Relevance: Comments Box uses social signals to surface the highest quality comments for each user. Comments are ordered to show users the most relevant comments from friends, friends of friends, and the most liked or active discussion threads, while comments marked as spam are hidden from view. Distribution: Comments are easily shared with friends or with people who like your Page on Facebook.

Comments

https://developers.facebook.com/docs/reference/plugins/comments/
The Follow Button used to be called the Subscribe Button. The Follow button lets a user follow your public updates on Facebook. There are two Follow button implementations: XFBML and Iframe. https://developers.facebook.com/docs/reference/plugins/subscribe/

Subscribe Button

The Send Button allows users to easily send content to their friends. People will have the option to send your URL in a message to their Facebook friends, to the group wall of one of their Facebook groups, and as an email to any email address. While the Like Button allows users to share content with all of their friends, the Send Button allows them to send a private message to just a few friends.

Send Button

https://developers.facebook.com/docs/reference/plugins/send/

Like Button

The Like button is a simple plugin that will let people quickly share content with their friends on Facebook. When someone clicks on a Like button on a site, a connection is created in the Graph between the content and that person: an Open Graph Like action will be published, and stories will appear on that person's timeline and their friends' news feeds. This story will link back to the site and drive distribution of content. The story created by the Like action can be enriched by using meta tags to turn a simple HTML page into an Open Graph object . If you plan to use the Like button on any page on your website, you should follow the guide to including meta tags to ensure published stories look great in news feed, on Timeline, and get the best possible distribution from people. https://developers.facebook.com/docs/reference/plugins/like/