How to mention someone in Blogger Blogspot posting.

To mention someone in a post or comment:

1. Type +[person's name] or @[person's name]. (You can also type their email address instead of their name.)
2. As you type, an autocomplete list of people will appear.
3. Select the person you want to mention.

My addendum:

You can also copy a twitter handle from Twitter.com and that includes the hyperlink to Twitter in your post.