BuddyCircles: The BuddyPress User Circles plugin is an add-on for BuddyPress. It allows users to create lists of users, e.g. Family, Close Friends, Colleagues, etc.

Features:​

• Allow users to create circles of users(or lists of users).
• Filter activity by circles.
• Circle notifications.

And here is a list of all features for site admins:-

• Limit circle creation by roles.
• Configure if the circle will be a top-level tab or be managed under the friends component.
• Restrict who can be added to the circle:- Friends or all members.
• Control circle privacy.
• Automatically create default circles for newly registered members.
• Control notifications for add to circle or remove from the circle.
• Customize notification emails.

BuddyCircles is most suitable when you want your users to have the ability to create multiple lists of users and optionally follow their activity.

Screenshots:​

Adding a user to circle:-Social Subscribe Box is a fun-filled way to let your users subscribe to your Mailchimp newsletter on your site. It also supports linking to your social media profiles(for Facebook, Twitter, Google+ & LinkedIn).

Features:​

• Mailchimp Newsletter Subscription
• Social profile links for Twitter, Facebook, LinkedIn, Google+
• Completely customizable behavior and appearance(slideout box behavior/appearance)
• Simple, easy and fun, and lightweight.

We strongly believe that the plugins should be simple, lightweight, and fun. All the plugins that we wanted to use had a lot of unnecessary bloats. That's why we wrote our own. You can see it in use on this site.