Make it simpler for your visitors to bookmark your content by placing an u n f o r g e t button on your pages.
Increase engagement, broadcast a notification to all bookmarks. Tell people about a new blog post, feature or anything at all. Notifications will appear as the standard counter badge in unforget interface of people who have at least one bookmark pointing to your web site, they are not emails.
You can only push batch notifications to all at once.