apply_filters( "bp_get_blog_avatar_{$blog_id}" )
In future BuddyPress versions you will be able to set the avatar for a blog.
Description
Right now you can use a filter with the ID of the blog to change it if you wish. By default it will return the avatar for the primary blog admin.
This filter is deprecated as of BuddyPress 1.5 and may be removed in a future version. Use the ‘bp_get_blog_avatar’ filter instead.
Source
Questions?
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