I think they meant to include people who are known for actually working, not for being tabloid darlings or scandalous. I guess that's why we wouldn't know who everyone is....
Honestly a lot of the people listed haven't even appeared in anything "grown up" this list seems more appropriate for teen vogue, or cosmo girl. there are hardly any "sophisticated" young actors.
At least when Scarlett Johansson, Kate Hudson, Keira Knightley were on these type of lists they actually had real buzz about their film projects.