Currently the "Known for" widget for actors seem to be sorted by the date of the show/episode they can be last seen in. Although, IMHO it would make much more sense to sort this by the amount of episodes they starred in.
For example, Jennifer Carpenter is known by most for her role in Dexter. She starred in 92 Dexter episodes. Yet Dexter is the last result in the "Known for" widget. That just doesn't feel right to me. :-)