Boone Gorges

If you install BuddyPress on an already thriving WordPress installation, you’ll notice that existing blog comments and posts are not inserted into the activity stream. This plugin fixes that.
Requires WordPress Multisite

BP Import Blog Activity

Updates BuddyPress activity streams with missing blog comments and posts

BuddyBoss

Let your BuddyPress members edit their activity posts and replies on the front-end of the site. You can even set a time limit for how long activity posts should remain editable.
Just activate the plugin, and every activity post and reply will become editable, styled automatically by BuddyPress to fit with your theme.

BuddyPress Edit Activity

BuddyPress Edit Activity allows your members to edit their activity posts on the front-end of your BuddyPress-powered site.

BP Import Blog Activity vs BuddyPress Edit Activity