02-01-2013 05:04 AM
I can find the apps on BlackBerry World on my Dev Alpha B.
I installed Twitter, but unfortunately it doesn't work. It lets you add an account and shows your mentions in the hub, but the app itself doesn't sign in. You can't tweet or reply from the Hub either. @BlackBerryDev already posted on Twitter that they are looking into it: https://twitter.com/BlackBerryDev/status/296755800
There seems to be a difference between Dev Alpha A and B devices though. I just had a look at BlackBerry World on the Dev Alpha A of my colleague and couldn't find Twitter there.