Re: How can I set “Show NewBlogPosts” as default on acitivity-stream?
Glad i could help 
@guigoz: all of the following support multiple arguments (this is right out of the bp-activity.php – line 577)
* ‘user_id’ => false, // user_id to filter on
* ‘object’ => false, // object to filter on e.g. groups, profile, status, friends
* ‘action’ => false, // action to filter on e.g. activity_update, profile_updated
* ‘primary_id’ => false, // object ID to filter on e.g. a group_id or forum_id or blog_id etc.
* ‘secondary_id’ => false, // secondary object ID to filter on e.g. a post_id
