psTwit is a PSP Twitter app that was recently released. In case the name didn't give it away for you psTwit is a Twitter client app that you can use on your PSP. The changelog and developer notes are listed below. Keep in mind that this is a Beta version so there will be some more updates coming soon. We'll keep you posted.
"psTwit BETA 5.0
This is a Twitter client application can be used in PSP.
Since it is beta version is incomplete.
Because it uses extended memory is only PSP-2000/3000 . Version for the PSP-1000/PSVita will be released at a later date.
Beta5 New!
• Search
-App in the browser capability
Open the URL in the tweet.
-UserStream support
Is the implementation of a pilot.
Note: beta5 is a trial version . I think Beta 4 is stable .
Past updates"
Source
