Daniel's Google+ page was updated again yesterday with a message in which he talks about a book he received for Christmas which is Letters of Note ("correspondence deserving of a wider audience") a compilation of letters, postcards, memos, etc.) and, like you can read below, he will share a link from the Letters of Note website every Friday. So below you find the first one.
"Hi everyone on Google Plus! I want to share with you a brilliant book I received for Christmas. It's called LETTERS OF NOTE and is a compilation of letters, postcards, memos, etc. I'll provide a link each Friday to one of my favourites, but you can dig in now and read all you want online!"Here's the link: I Like Words - Robert Pirosh
"My first pick is I LIKE WORDS from Robert Pirosh."
The Google+ link at this page is Dan's post shared via this site's Google+ page.