We initially had independent sign up as an option and probably will do that again in the future.
The reason we ditched it, is because Subjot is a network effect product. It's WAY better if you can find some friends already using it, which was far more likely for a user if they signed in with Twitter/FB rather than had the option to do that later in the process.
Subjot is still small and in "private beta" in the true sense of the word (we didn't expect the internet to find us yet) so you may still not have any friends using it but some people do!
