The Official Squarespace Blog - Blog - Squarespace Social Widgets Release:
"Some big news! Our social widgets are now rolling live for our customers. The widgets are now running on our live servers and a group of commando testers have been trying their best to break them over the past few weeks. I'll admit we spent about a week or two longer than I would have hoped on this, but I hope it's worth the wait. The dust has settled and we're pretty confident they're in good shape."