diff --git a/app/models/profile_list_block.rb b/app/models/profile_list_block.rb
index cb49e20..456b588 100644
--- a/app/models/profile_list_block.rb
+++ b/app/models/profile_list_block.rb
@@ -6,9 +6,25 @@ class ProfileListBlock < Block
     _('A block that displays random profiles')
   end
 
+  # Override this method to make the block list specific types of profiles
+  # instead of anyone.
+  #
+  # In this class this method just returns <tt>Profile</tt> (the class). In
+  # subclasses you could return <tt>Person</tt>, for instance, if you only want
+  # to list people, or <tt>Organization</tt>, if you want organizations only.
+  #
+  # You don't need to return only classes. You can for instance return an
+  # association array from a has_many ActiveRecord association, for example.
+  # Actually the only requirement for the object returned by this method is to
+  # have a <tt>find</tt> method that accepts the same interface as the
+  # ActiveRecord::Base's find method .
+  def profile_finder
+    Profile
+  end
+
   def profiles
     # FIXME pick random people instead
-    Profile.find(:all, :limit => self.limit, :order => 'created_at desc')
+    profile_finder.find(:all, :limit => self.limit, :order => 'created_at desc')
   end
 
   def random(top)
diff --git a/test/unit/profile_list_block_test.rb b/test/unit/profile_list_block_test.rb
index e6761d0..46c7003 100644
--- a/test/unit/profile_list_block_test.rb
+++ b/test/unit/profile_list_block_test.rb
@@ -40,6 +40,17 @@ class ProfileListBlockTest < Test::Unit::TestCase
     assert_kind_of String, instance_eval(&block.content)
   end
 
+  should 'find in Profile by default' do
+    assert_equal Profile, ProfileListBlock.new.profile_finder
+  end
+
+  should 'ask profile finder for profiles' do
+    block = ProfileListBlock.new
+    block.expects(:profile_finder).returns(Profile).once
+    Profile.expects(:find).returns([])
+    block.profiles
+  end
+
   should 'pick random people'
 
   should 'use Kernel.rand to generate random numbers' do
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