I have the exact same issue.
I just updated all my plugins on a new site https://www.projectfreedomblog.com using 3.9.1. I don’t remember the theme and can’t check it now of course. Maybe Clean Retina or Catch Box.
Error Code: Parse error: syntax error, unexpected T_STATIC, expecting T_STRING or T_VARIABLE or ‘$’ in /home/content/28/9856828/html/projectfreedomblog/wp-content/plugins/async-social-sharing/async-share.php on line 53
Here’s a list of all the plugins that I just updated all at once:
Async Social Sharing
You have version 1.7.1 installed. Update to 1.8.0. View version 1.8.0 details.
Compatibility with WordPress 3.9.1: 100% (according to its author)
BotDetect CAPTCHA
You have version 3.0.Beta1.7 installed. Update to 3.0.Beta3.3. View version 3.0.Beta3.3 details.
Compatibility with WordPress 3.9.1: 100% (according to its author)
Jetpack by WordPress.com
You have version 3.0.1 installed. Update to 3.0.2. View version 3.0.2 details.
Compatibility with WordPress 3.9.1: 100% (according to its author)
Livefyre Realtime Comments
You have version 4.1.2 installed. Update to 4.1.4. View version 4.1.4 details.
Compatibility with WordPress 3.9.1: Unknown
NextScripts: Social Networks Auto-Poster
You have version 3.3.7 installed. Update to 3.3.9. View version 3.3.9 details.
Compatibility with WordPress 3.9.1: 100% (according to its author)
Optin Revolution
You have version 1.3.5 installed. Update to 1.3.7. View version 1.3.7 details.
Compatibility with WordPress 3.9.1: 100% (according to its author)
Sweet Captcha
You have version 3.0.6 installed. Update to 3.0.8. View version 3.0.8 details.
Compatibility with WordPress 3.9.1: 100% (according to its author)
Compatible with WordPress v3.9.1, Gravity Forms and Buddypress support
WordPress SEO
You have version 1.5.3.2 installed. Update to 1.5.3.3. View version 1.5.3.3 details.
Compatibility with WordPress 3.9.1: 100% (according to its author)
WP to Twitter
You have version 2.8.8 installed. Update to 2.8.9. View version 2.8.9 details.
Compatibility with WordPress 3.9.1: 100% (according to its author)