BuddyPress Sticky Post plugin comes with the feature that lets site administrators prioritize certain activities over others.
As its name suggests, BuddyPress Sticky Post lets admin pin-up site-wide and groups activities to the top of BuddyPress activity list.
This will make it easier for the site administrator to make the pinned activity item recognized first by the community whenever they visit the site.
With BuddyPress Sticky Post, one will not have to worry about scrolling through the long list of activity and conversations to see the latest updates in the pinned activity items.
In general setting, there is pin post label and unpin post label. Admin can set the label accordingly.