Try to “like” something on the Internet and you will see that the information posted to your profile wall is pretty much the same as the one that appears when you share something. In other words, your friends will now see a full story including a headline, blurb and thumbnail and not only a link to the story (this is how it worked before the recent functionality change). In addition, they will also have an option to comment on it.
This is quite a significant change in the button functionality. In fact although the idea of “I like” button has always been great from the marketing point of view (“consumers say they like your product”) some companies were opting for the Share button because the information posted to the user wall was much more visible.
So what does it mean? Will “I like” button replace “Share” button? According to the Facebook Spokeswoman Malorie Lucich (check the complete article published at Mashable) “while Facebook will continue to support the Share button, Like is the “recommended solution moving forward.”