Innocuous But Very Powerful. Facebook's Like Button
Facebook decided on this approach for a number of reasons. The act of liking something with a single click requires minimum effort (especially if you're already logged into Facebook) and people's association with the term "Like" is a very positive one. The pass-on value that your friends like something does encourage others to check it out to see whether or not they agree.
But it offers so much more than this. If you are a company/brand, adding a like button to the various areas of your site, will help gain exposure in the way explained above. If it is added to your site in the right way, you can also gain exposure to potentially untapped areas of Facebook too. The "Like" button is part of Facebook Open Graph, and the various buttons on your site can be associated with pre-defined Open Graph Objects. The full Open Graph Object list is not that extensive currently, but it is expected to grow. For example, if your website "About Us" section had a description of the senior management team, it is possible to add a "Like" button to each profile and associate this with the "Director" or "Public Figure" object. Not that exciting, but if your business has key people, deemed influential in their field, making sure their profile has good content and include information that some may wish to share and be associated with, why not add a "Like" button? By adding this to the "Director" object will mean the profile will gain exposure in Facebook in areas where Director is being discussed. An example of this is below:
Appearing in the "Director" interest page, will gain exposure to those people who have already liked this page. It may help if this person is a musician too, as "Musician" has a much higher level of exposure of currently 38,000+. This of course does mean the objects can be played about with and it isn't surprising that some likes are associated to the wrong categories on purpose. Short term thinking behind this is to gain higher levels of exposure, however, the audience who like something and are presented with something irrelevant to their likes, will not be impressed and this could tarnish reputation etc.
But, potentially more important than this, and probably the main driver for Facebook, is the re-indexing of the web for search purposes. Imagine a place in the not too distant future, where content is presented to you after a search which is sorted by the number of likes. Relevant content to your search term, which is ordered by the most likes i.e. I want to search for an article on "power of Facebook like". This article would feature nowhere!! (please "Like" it) But should someone with a much bigger following eg. Mashable write a post on this, there is a very strong chance they will be at the top. We could argue, very badly, that this content is just as valuable, but they get the "votes" from many more people and quite rightly will rank much higher.
So, if your site has great content and you offer products, services, information, whatever really, get the "Like" button up there. It has a very strong relevance for the future.

