One of the most repeated statements in marketing is that a mailing list is the most important asset an online business can build. And the reason is simple: nothing else gives you the kind of on-demand traffic that a mailing list does.
Ninja Popups combines a professionally designed popups to convert visitors on your site/blog into taking an action whether its subscribing into your newsletter, offering a discount/coupon for leaving customers, or locking content until they share you will increase your subscriber count and social signal of your site/blog.
FormCraft works on one standalone installation, or any one site on a WPMS installation. An add-on is required to use the plugin across all the sub-sites of a WordPress Multi-Site Installation.