Weird thing I noticed today. Just a couple days ago I had four apps listed in Cortana, these were Foursquare, Tumblr, Twabbit and WPCentral. Since then I have installed some apps and got updates to existing ones. Today I checked Cortana's apps to see if any new apps were added. Again there were only four apps in the list but somehow Foursquare and Tumblr were replaced with Audiocloud and Goal.com. This made me wonder if Cortana only supports four apps at a time, I tried to use Foursquare to see if the list is there as a sample you know, like just a showcase for Cortana's capabilities or as an example of things you can do in Cortana. To my surprise "foursquare check-in" did not work, I haven't used Tumblr with Cortana before so I'm not familiar with its commands but I've used foursquare a couple times and its strange that it got replaced as it's the most app command I used with Cortana. Did anyone notice the same thing?