BuddyPress Activity Autoloader plugin automatically loads activities when a user reaches at the bottom of the page. It just simulates facebook like infinite activity auto loading of activity with BuddyPress.
For more, Please read this blog post .
Disabling on Mobile Browsers:-
If you are using version 1.0.2 or newer, you can disable it on mobile browsers by putting this code in your bp-custom.php or your theme's functions.php
add_filter( 'bp_activity_autoloader_disabled', '__return_true' );
Github Repo Link: https://github.com/sbrajesh/bp-activity-autoloader