Linn's Stamp News gives you a quick look at what's going on in the world of stamp-collecting.

1. Happy St. Patrick's Day

Happy #StPatricksDay! We're celebrating Irish culture and heritage today - here's our Irish Immigration stamp: http://t.co/NKnmPjNTTU

— Postal Museum (@PostalMuseum) March 17, 2015

Happy St Patrick’s Day! Tell Mother Nature to join in with some green too! pic.twitter.com/POSesz3gaJ

— Canada Post (@canadapostcorp) March 17, 2015

Happy St. Patrick's Day! Ireland issued this stamp featuring an illustration of St. Patrick inspired by 1922 stamps. pic.twitter.com/xGUX7GSBcv

— Amer Philatelic Soc (@APS_stamps) March 17, 2015

Happy #StPatricksDay! pic.twitter.com/mryackxgyJ

— BPMA (@postalheritage) March 17, 2015

World Stamp Show-NY 2016 wishes you a happy #StPatrick'sDay. Top o' the mornin' to ye! http://t.co/R5TaOisFlV

— WorldStampShowNY2016 (@WorldStampShowN) March 17, 2015

2. You Bought It

We asked what stamps were purchased over the weekend, and you answered.

Check out our latest "You Bought It" post.

3. Selma postmark

"The United States Postal Service has authorized a commemorative postmark for the 1965 civil rights march from Selma, Ala., to the state capital in Montgomery, a key event in U.S. civil rights history."

4. Yesterday's most-viewed post

Survey result: Americans still love the U.S. Postal Service

5. Being social