BuddyPress.org

Looks like it’s going into bp_blogs_new_blog_activity to me?

Do a find in the BP code for that function and see where other functions hook into it?

Not sure what you use to code, but I use Notepad++ that has a “search through files” function so you don’t have to have all of the files open, and it will search through sub directories and you can filter for specific file types.