lakrisgubben

This plugin uses BuddyPress’s notification system to let users subscribe to all new posts on a site (or many sites if you run Multisite). When a new post is published all users subscribed to the site gets a notification and optionally an email (can be turned off in their BuddyPress email settings).
<h4>Requires</h4>
<ul>
<li>BuddyPress 2.3 or later</li>
<li>WordPress 4.3 or later</li>
</ul>

BP Site Subscriber

This plugin uses BuddyPress's notification system to let users subscribe to all new posts on a site (or many sites if you run Multisite).

shawfactor

Requires BuddyPress 5.0 or greater.
This plugin segregates BuddyPress social networks in a multi network WordPress install so that each WP network has a different social network.
All functionality, eg groups, friends, profile fields, activity etc are now independent for each site
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LH Buddypress Multi Network

Segregate your multsite into multiple buddypress social networks.

BP Site Subscriber vs LH Buddypress Multi Network