Still, I would have been more impressed if he actually had written a TCP/IP stack and Twitter client, instead of just displaying tweets received on a PC...

Yeah, that would have been impressive. Considering the typical Twitter user PNG is larger than most Apple ][ programs in their entirety, it would be a massive feat (unless you add your own bank-switched memory or something).

Surely this could be done using something like Contiki?

How does the PC communicate with the IIe? Serial?

Nostalgic. Reminds me of the better days, the days when you could run any software you wanted on your Apple device, without even buying a signing certificate!

Yeah. This title made it seem far more cooler than it actually is.

Because all it is, is a dumb terminal, really.