You can bold Sociality, I might start on a QML version since the only reason I hated/disliked QML was memory usage and with 1GB of RAM, that's not a valid reason :P
This is just a suggestion. But imo there should not be any standalone apps for social networking. I think developers of social network apps should focus on integrating functionality into already existing Nokia apps i.e integrating facebook into the feeds view.
I've already started prototyping deep facebook and twitter integration into the Nokia feeds and contacts app. The open nature of Meego drastically reduces the need for standalone apps. I think it would be wise for all devs to adopt this mindset.
Seriously, though, I'm hoping that phone comes with decent bluetooth mouse/keyboard support right out of the box, but if that's not the case (), I'd say those are top priorities, especially for people who use the device as a pocket computer.