The Twitter app for Windows Phone 8.1 is receiving a nice update today that adds a couple of new features. With this update, you can now use Cortana to launch a new Tweet in the Twitter app by saying something like “Cortana, Twitter new Tweet I love Twitter”. You can also now share websites from Internet Explorer on your Windows Phone to the Twitter app. If you don’t have the Twitter app installed, you can download it here from the Windows Phone Store
There is a bug in older builds of Windows Phone 8.1 that prevents the Twitter app from launching when you tap on the tile. You will want to make sure you are running the latest available update
for your Windows Phone (or from the Preview for Developers
if you are running a preview build) before installing this update. If you do encounter this issue, there are a few steps you can take to get the Twitter app working again: you can go to Settings > Backup > apps + settings and choose “Backup now”. Alternatively you could try to uninstall and reinstall the app.