Microsoft Tag is finally out of beta. I created this a while ago with the beta program using PowerPoint. This would take you to my Twitter profile page. You can download the tag reader to your phone and scan this tag.
The easiest way to create a tag for Twitter Profile is to use http://twittag.me/.
If you want to overlay your own picture with PowerPoint, follow these instructions.
Here’s a simple report of the scans you received at http://tag.microsoft.com.
Have fun.