MailPoet comes with a “subscribe in comments” option that allows visitors who comment on a post to subscribe to your list via a checkbox. But this box is unchecked by default. With this jQuery snippet, you can have the box auto-checked on page load.
Snippet
Check If An Email Address Has A Valid Gravatar Using PHP
PHP code snippet to test whether a user has a valid Gravatar or not. The only input needed is the user’s email address. It uses MD5 hashing and URI response headers.
Remove NoFollow From JetPack Related Posts Links
By default JetPack adds a nofollow attribute to all links in the related posts section. You can use this PHP code snippet to remove/disable this nofollow attribute.