Once "installed", on first run the UI came up, and I found the option for "Add Social Network" (the application should guide the user through the setup with a wizard), but it produced a Gecko error screen saying it couldn't find the name www..yoono.com. Hitting try again didn't help. The address, however, resolves and loads fine in FF.
I exited and restarted. Now the "Add Social Network" option does nothing. I also tried the option to check for updates, which similarly complained about not being able to communicate with the server.
I exited and restarted from a console to see what got logged, and saw:
Gtk-Message: Failed to load module "canberra-gtk-module": /usr/lib/gtk-2.0/modules/libcanberra-gtk-module.so: wrong ELF class: ELFCLASS64
LoadPlugin: failed to initialize shared library /usr/lib/mozilla/plugins/mozplugger.so [/usr/lib/mozilla/plugins/mozplugger.so: wrong ELF class: ELFCLASS64]
LoadPlugin: failed to initialize shared library /usr/lib/totem/gstreamer/libtotem-cone-plugin.so [/usr/lib/totem/gstreamer/libtotem-cone-plugin.so: wrong ELF class: ELFCLASS64]
LoadPlugin: failed to initialize shared library /usr/lib/totem/gstreamer/libtotem-gmp-plugin.so [/usr/lib/totem/gstreamer/libtotem-gmp-plugin.so: wrong ELF class: ELFCLASS64]
LoadPlugin: failed to initialize shared library /usr/lib/totem/gstreamer/libtotem-mully-plugin.so [/usr/lib/totem/gstreamer/libtotem-mully-plugin.so: wrong ELF class: ELFCLASS64]
LoadPlugin: failed to initialize shared library /usr/lib/totem/gstreamer/libtotem-narrowspace-plugin.so [/usr/lib/totem/gstreamer/libtotem-narrowspace-plugin.so: wrong ELF class: ELFCLASS64]
LoadPlugin: failed to initialize shared library /usr/lib/jvm/java-6-sun-1.6.0.16/jre/lib/amd64/libnpjp2.so [/usr/lib/jvm/java-6-sun-1.6.0.16/jre/lib/amd64/libnpjp2.so: wrong ELF class: ELFCLASS64]
LoadPlugin: failed to initialize shared library /var/lib/flashplugin-installer/npwrapper.libflashplayer.so [/var/lib/flashplugin-installer/npwrapper.libflashplayer.so: wrong ELF class: ELFCLASS64]
/usr/lib/gio/modules/libgiogconf.so: wrong ELF class: ELFCLASS64
Failed to load module: /usr/lib/gio/modules/libgiogconf.so
/usr/lib/gio/modules/libgioremote-volume-monitor.so: wrong ELF class: ELFCLASS64
Failed to load module: /usr/lib/gio/modules/libgioremote-volume-monitor.so
/usr/lib/gio/modules/libgvfsdbus.so: wrong ELF class: ELFCLASS64
Failed to load module: /usr/lib/gio/modules/libgvfsdbus.so
This makes me wonder if your build is incompatible with Ubuntu 9.04. I didn't see any list of compatible Linux distributions or versions, so it's hard to say.
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