Where did you place these tags in the index file? It might be that you put it in the wrong spot and that it got overwritten by the dynamic content.
The tags that you have should be working. I was able to play with facebook and linked in tags before and got them to work. However I would recommend to include these in your layouts or pages rather than the html file. That way you have more control over where they will actually render.
You can still include the javascript just below the <body> element and before the first