Facebook profile pic used as avatar

To sum up, I’d like a plugin or a code so that visitors to my blog are
automatically represented with their FB profile pic (if they are
already logged in to Facebook) without the need for them to register
or log in with FB details to my blog.

There is no possible way to do this. You cannot get somebody’s Facebook information without them first “connecting” to your site via a Facebook Application.

In short, if you are limiting your question to this condition (the visitor not connecting to your site in some manner and thus granting permissions via an FB application), then it cannot be done in any way whatsoever.

Related Posts:

  1. How to use author’s avatar as Facebook post preview image when a single post is shared
  2. get avatar from facebook graph [closed]
  3. Official Facebook Connect button as PNG
  4. Use Device Login on Smart TV / Console
  5. Invisible characters – ASCII
  6. When do I need a fb:app_id or fb:admins?
  7. When do I need a fb:app_id or fb:admins?
  8. Warning: Each child in an array or iterator should have a unique “key” prop. Check the render method of `ListView`
  9. Warning: Each child in an array or iterator should have a unique “key” prop. Check the render method of `ListView`
  10. og:url is driving me crazy?
  11. Face recognition via facebook API
  12. FB is not defined javascript
  13. What are App Domains in Facebook Apps?
  14. How can I control the Facebook like image? [closed]
  15. How can I auto-add my posts to my site’s Facebook fan page?
  16. Automatically Facebook Debug Posts on Publish [closed]
  17. If your blog was an app on Facebook
  18. Facebook OAuth, WP_Http::request() vs wp_remote_request()
  19. W3 Cache plugin and Facebook sharing [closed]
  20. FB – Comment Moderation Tool bug? [duplicate]
  21. Any Facebook component doesn’t work on WordPress website after update. Why?
  22. Facebook sharer and parameters in URL
  23. How to control Facebook share information for the front page?
  24. sharing video on facebook from wordpress
  25. Open graph metadata isn’t pulled on Facebook until after I run that specific link through the debugger
  26. facebook like – image display and description
  27. Is there a method or plugin that will allow posts to be sortable by Facebook likes?
  28. How do I create a page for users to invite their facebook friends?
  29. Which social connect plugin do you recommend? [closed]
  30. How to generate “og:image” meta for Facebook sharing when the image in the post is not featured?
  31. Facebook Like Button in Jetpack [closed]
  32. How do I remove all hyperlinks that begin with a #?
  33. Simple plugins to post info about new blog entries?
  34. Facebook link to website logo
  35. Get User’s Facebook Photos as WordPress Upload
  36. Trigger a function immeditely after a user posted a comment
  37. Hiding styles from Facebook
  38. WordPress comments and Facebook comments
  39. Building a Member Directory Site on WordPress with Facebook API Integration?
  40. WP_Cron script not updating all posts in loop
  41. Automatically add simple custom buttons for print, Facebook share, & Tweet in Posts [closed]
  42. How to let user select role upon registration in Facebook-AWD?
  43. Choices for thumbnail image in a Facebook Link post
  44. Displaying Facebook comments count with tag
  45. Remove text from my Facebook posts
  46. fb share site shows blank image
  47. Facebook / LinkedIn share page – https opengraph issues [closed]
  48. How to integrate Facebook Share button without code?
  49. Facebook share functionality in wordpress loop
  50. Integrating Facebook calender to WordPress
  51. Open Graph in posts loop page
  52. Is there a way of putting the facebook social plugins into page template php files?
  53. Conditional Facebook Share and Like links [closed]
  54. FB Comments box post to wall?
  55. Post image lacking when pasting link into Facebook despite the correct og:image meta tag
  56. Trouble displaying featured image as thumbnail when using Facebook share
  57. How do I set a featured image for the homepage? [closed]
  58. Adding a list of social media links
  59. I want to enable facebook connect how to do this?
  60. file_get_contents_curl pulling wrong values
  61. Custom avatars in wordpress comments?
  62. Facebook Registration Tool: how to use in WordPress? [closed]
  63. How to see more WordPress images when posting to Facebook
  64. WP REST API – log in with Facebook
  65. How to implement custom buttons into individual posts?
  66. Store SNS share value via function.php
  67. Single article separated into multiple pages makes Facebook Like button detect as completely separated articles
  68. Simple Facebook Connect: Access tokens not found
  69. Load facebook php sdk problem
  70. Facebook comment url is unreachable
  71. WordPress > Error when pasting link into Facebook
  72. How to install Facebook, Google+, & Twitter LIKE buttons for each individual post at frontpage?
  73. Changing the Permalink Structure without Resetting the Facebook Like Counts?
  74. How do I get a list of users who LIKED a post to show in admin of page?
  75. open graph image being overwritten by gravatar logo?
  76. Multiple account integration with facebook
  77. Facebook embeds fixing with functions.php
  78. How to automatically search my entire site for any content embedded using oEmbed?
  79. How to transfer the Facebook instance articles from one WordPress to another WordPress with same domain name?
  80. Set Canonical URL to GIF for Facebook
  81. WordPress website Thumbnails not showing on Facebook Share
  82. How to (correctly) embed a Facebook video?
  83. Featured image not showing on facebook share
  84. image share on facebook missing
  85. Featured Image and Facebook
  86. Facebook and Google+ sharing suddenly stopped working properly in WordPress
  87. Disable Jetpack Publicize for blog but keep for custom post type [closed]
  88. FaceBook fan-block in a text-widget
  89. Automatic connect wordpress to facebook with featured image?
  90. Create Mashable Follow-like Facebook, Twitter login/connect?
  91. How to make a share-this window drop when reaching end of post?
  92. Right Facebook Open Graph Protocol into WordPress theme?
  93. get facebook status
  94. Facebook share post dialog not showing post information
  95. Problem embedding a page on facebook [closed]
  96. Facebook Share button wont recognize embedded video [closed]
  97. How Facebook.com knows about duplicate pages on my site?
  98. Force Jetpack to use og:url with http on an https website
  99. Bigger images when sharing a link with facebook
  100. How to write ‘post to facebook’ action in Uncanny Automator
error code: 523