Hello @joonaskoo !

Well, it's better to use the channels instead of the category because they have the own profile feed which is comfortable to show all added content there. Just add via the Developer->Pages app the service method with the following code:

array (
  'module' => 'bx_timeline',
  'method' => 'get_block_view_profile',
  'params' =>
  array (
   0 => 'bx_channels',
   1 => 1,
  ),
)

where

   1 => 1,

means the channel with id=1, so for the second it would be

   1 => 2,