It means it’s Pentecost Sunday. And the folks who brought you #baconless during Lent are back with another Catholic meme. Just like the apostles went forth regardless of language, you’re invited to evangelize whatever your preferred social network. So on Pentecost, check in using hashtag #MassCheckIn whether you’re on Facebook or Foursquare, and tag a photo on Flickr or Instagram. See more info about #MassCheckIn.
Church Mojo 
Thanks for the shout out Mark!
Happy to spread the word! And your meme also gave me the chance to test out the WP iPhone app — I was able to make the post on my phone on the road in between my middle son’s soccer games!