Author bio Social Links

You need to check, if the field is empty or not before printing link using the get_the_author_meta function.

<?php if(!empty(get_the_author_meta('twitter'))) { ?>
   <a href="https://wordpress.stackexchange.com/questions/75981/<?php the_author_meta("twitter'); ?>" title="Twitter" target="_blank" id="twitter"><img src="/images/twitter.png" alt="Twitter" /></a>
<?php } ?>

or, try

<?php if(!empty(get_user_meta(get_the_author_meta('ID'),'twitter'))) { ?>
   <a href="https://wordpress.stackexchange.com/questions/75981/<?php the_author_meta("twitter'); ?>" title="Twitter" target="_blank" id="twitter"><img src="/images/twitter.png" alt="Twitter" /></a>
<?php } ?>

but, for some reasons, followed code fixed it

<?php if(strlen(get_the_author_meta('twitter')) >5) { ?>
   <a href="https://wordpress.stackexchange.com/questions/75981/<?php the_author_meta("twitter'); ?>" title="Twitter" target="_blank" id="twitter"><img src="/images/twitter.png" alt="Twitter" /></a>
<?php } ?>

Related Posts:

  1. Clean links in: the_author_meta(‘description’)
  2. How to check if a user (not current user) is logged in?
  3. get post author id outside loop
  4. Woocommerce: assign an “author” to a product
  5. Programatically change post author
  6. Restrict one post per author
  7. Author page: Comments and Ratings?
  8. How to get post author name by its ID inside a function?
  9. If Else Gravatar Author Picture
  10. Add rewrite endpoint to author page + pagination
  11. How to set up sub-categories for author pages?
  12. How can an author be subscribed to the posts of another author and receive notifications of the new posts?
  13. How we can get the author ID by its Name
  14. How to hide posts count and posts of other users from edit.php for contributors and authors
  15. How to have a static category/author page?
  16. Creating distinct pages for author profiles and lists of posts by author
  17. Making WordPress author follow button, need missing ingredient
  18. Get the comment author ID by the comment ID
  19. Author profile visitors in last 7 days in front end without plugins
  20. How To Remove The Author(s) From Certain Posts
  21. Remove /author/ from the author profile url
  22. Google Authorship on a multi-author blog?
  23. Replace Gravatar with img URL for avatars
  24. Change author base slug to user role
  25. Custom Author Fields + Existing Taxonomy – Integrating the Two Dynamically?
  26. Display Author role in archive or author page
  27. How to Add Author Editing Capability to Existing Post by Admin
  28. WordPress Author Page
  29. Limit REST API output to current logged in user that is also author of the content
  30. Display only entire most recent post on author page?
  31. Author list ‘special’ author first then ‘normal’ author
  32. hide something in single page if current author has only one post
  33. Custom Author Loop
  34. get_the_author_meta( $field, 0 ) returns the administrator $field
  35. Showing author’s page with no posts
  36. Plugin for an author bio popup box?
  37. How to link to the current User/Author Profile page?
  38. Paginate Author’s Post List on Custom Author Page (ANOTHER THEORY)
  39. Conditional/Check: IF comment author is the post author
  40. Get last revision author, author-link and date
  41. What do you put in child themes author tag?
  42. Make user as Default contributor for all Blog Posts
  43. How to list the authors of all revisions？
  44. WordPress doesn’t show all posts of a specific author
  45. Custom avatar image link added to the profile page
  46. Advanced author permalinks
  47. Post list based on the page author
  48. Show Author information on post page on dashboard
  49. Author posts url… way to get display name to be url instead of user’s ID?
  50. Display emails of users who already posted at least once
  51. Get author’s first name
  52. Display only author posts in dashboard all posts panel
  53. Get avatar of the logged-in user in WordPress
  54. How to get all possible arguments for a wordpress function
  55. What does the class look like that is returned from WP_User_Query?
  56. Breadcrumbs – get the author?
  57. Is author.php a core file?
  58. Allow Google crawler to crawl specific Author pages
  59. Add Date and Author to Posts
  60. Changes show up in view source but not live site
  61. author slug in the backend
  62. Can I Include author login in post class?
  63. Get 404 when try open author page
  64. get the headlines of the authors’ last post
  65. Get Author Count By Day, Week and Month
  66. Detect and make links nofollow in author description
  67. Working with Gravatars within a localhost development area
  68. Author Page Create Link to Page That Lists All Author’s Posts?
  69. Display Recent Posts in BuddyPress Profile
  70. Possible to switch between admin view and author view?
  71. How to show author page link
  72. Inline-Table under TwentyTwelve not working
  73. Display all authors in a theme template
  74. Add Post Author body class to WordPress
  75. Improving Co-Authors Plus Plugin [closed]
  76. How to show list authors with at least five posts published
  77. Show Published and Draft posts from Logged in Author
  78. Create condition for Author bio Social Links
  79. Best way to set up “reviewed by” in WordPress?
  80. Filter Author Link for Numerous Authors for each to go to unique page
  81. WHen I click on post author (on frontend) it doesn’t go to author page
  82. can’t see information on author page that don’t have posts
  83. How to create many author’s page?
  84. Show text only to the author of the article
  85. Display Random Post in Author Page
  86. Show author image at home page latestest posts plugin
  87. get_author_posts_url() Not working
  88. How to add custom Author Info Box to blog posts “only” and NOT custom post templates
  89. How to get the Author type Label Language
  90. Sticky post of current viewing author?
  91. How do you add Author and date Published on Category Pages?
  92. How to get latest page (not post) of User and display the content
  93. How do you display a comment into a mail?
  94. if else for custom $curauth-> field
  95. Author.php display profile for all types of users
  96. Author Link Not Displaying
  97. Profile Field In Admin Bar
  98. Removing “HTTP://” From the_author_meta?
  99. why is there an author.php
  100. How to force the Author Dropdown to display in Quick/Bulk edit?