Currently, the Main Board, the Talk Board and the Links Board all have 'I like this!' buttons for members to vote for posts they like.
The highest ranked posts are presented together on a popular page (one for each board).
While multiple votes and votes for your own posts seem to register, it remains a mystery as to whether an evil penalty is applied to the vote count.
*click*
Origin: http://www.b3ta.com/links/