Why You must add This?
Digg And plus One are Social bookmarking sites. So with Digg, you can become top of the search engine results for the keywords That you can't get with your blog. because Digg has a top PR.when many people suggest your blog by digging, It will be on top. Plus one is another Important thing to suggest your blog to others, specially It's a Google program. That's why this become so important.when you get more +1s it means your page that contains them will be suggest to others by Google.
When talking about Facebook Share button. I think i don't have to describe about it. It's so important to get more visitors (Traffic) Twitter is same.
