The entire concept of 'like' and 'share' via the open graph has been badly misread.
What OG gives Facebook is the ability to classify and index (not sure if they are doing this) 'active' pages on the internet. Look at it as a cheaper and more efficient way of classifying pages on the web that are being accessed by users. The OG metadata identifies the page content in a structured manner, thus offloading a lot of the classification pains to the content publishers.
It is a smart way of attacking the subset of active pages, but it can't compare to the indexing and classification of a larger web - which is what Google does.
Comments
The entire concept of 'like' and 'share' via the open graph has been badly misread.
What OG gives Facebook is the ability to classify and index (not sure if they are doing this) 'active' pages on the internet. Look at it as a cheaper and more efficient way of classifying pages on the web that are being accessed by users. The OG metadata identifies the page content in a structured manner, thus offloading a lot of the classification pains to the content publishers.
It is a smart way of attacking the subset of active pages, but it can't compare to the indexing and classification of a larger web - which is what Google does.