I subscribe to Starbucks' Facebook Page updates via SMS because I like to stay current with Facebook's most current brand marketer. With 5.1m Facebook fans, they tend to innovate... and also get seem to trial new Facebook features before others have access. Today, Starbucks sent Thanksgiving wishes to their fans and I noticed a seemingly new feature: the ability to "like" updates via SMS (in updates sent over the last two weeks, only "reply" function was available).
It is a natural product extension and a demonstration (as if one was needed) that brands want more tools to drive engagement and Facebook is working to enable it. It also demonstrates that the "like" function is becoming a more important part of the Facebook ecosystem - for pages, users and the feed.