When creating a BuddyPress site you will probably do lots of testing before officially launching. If you’ve filled up your activity stream with test comments, you’ll want to dump it before opening the site to your community. There are a couple of ways to do this.
Option 1: Empty the Activity table in your database.
This option involves getting into your database. Find the wp_bp_activity table and empty it.
Option 2: Empty all Activity entries in the Dashboard.