Is This Copyright Infringement? 3 Examples and Explanations

Fatal error: Uncaught Error: Call to undefined function split() in /home/customer/www/blog.clickandcopyright.com/public_html/wp-content/plugins/sociable/includes/sociable_output.php:354 Stack trace: #0 /home/customer/www/blog.clickandcopyright.com/public_html/wp-content/plugins/sociable/includes/sociable_output.php(729): sociable_html(Array) #1 /home/customer/www/blog.clickandcopyright.com/public_html/wp-includes/class-wp-hook.php(324): auto_sociable('<h2>&#8220;Is t...') #2 /home/customer/www/blog.clickandcopyright.com/public_html/wp-includes/plugin.php(205): WP_Hook->apply_filters('<h2>&#8220;Is t...', Array) #3 /home/customer/www/blog.clickandcopyright.com/public_html/wp-includes/post-template.php(256): apply_filters('the_content', '<h2>"Is this co...') #4 /home/customer/www/blog.clickandcopyright.com/public_html/wp-content/themes/responsive/partials/single/content.php(29): the_content('Continue readin...') #5 /home/customer/www/blog.clickandcopyright.com/public_html/wp-includes/template.php(792): require('/home/custom in /home/customer/www/blog.clickandcopyright.com/public_html/wp-content/plugins/sociable/includes/sociable_output.php on line 354