Loaded 10.0.10.261 and then did the update to 10.9.10.35.
I can confirm Facebook, Twitter is working. Also the OS feels much more snappier. I definitely recommend this route.
Also watermarks disappear after 10.9.10.35 update.
Also adding your email to HUB is quicker after update.
Just a note :
Update from 10.0.09.2372 to 10.9.10.35 is over 500MB
Update from 10.0.10.261 to 10.9.10.35 is about 350MB
Also the nice boot up screen from Z10 disappears and Dev Alpha boot screen is back