Usually when you want to share how one of your blog post on twitter and Digg? If you are using copy paste or use the plugin share the following article will help you save considerable time

A. For Twitter
Using Google’s Feedburner. Feed the list of sites that you have registered, click on one of your feed -> select Publicize >> Socialize.
Here, you select Add Twitter Account, then enter your Username and Pass your Twitter account, click Authorize app
In the Formatting Options, then you can leave the default or adjust as you wish. finally, click Active, then click Save. 
Two. For Digg.com
To automatically share your post to digg.com login account -> Settings -> Import Feeds
Enter your blog feeds
Enter your feed -> select add feed, at which point you will see will ask you to verify digg.com code has the form
You should choose the 2 for easy (Copy & Paste this key in your next post) -> log blog, create a new article, and add it into the code.
Note the article you edit or create new ones to use as html, if a blog wordpress
You wait a few minutes and then feeds back to import and then click Verify Now
Ok, you can see Verified, as shown by me.
Note: if during the import process at digg.com feed you see an error message is do not panic or click on the “Report the bug”. Wait a few minutes and try again, if you copy and paste the correct code, you definitely will verify the
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