315K at Facebook before or after bonuses and accrued stock? I think you need to be a level E8 or more at Facebook to get that kind of standalone salary.
Except you never really got any of the stock if you left within 8 months, right? Couldn't hold out for 4 months more to get all your vesting? You probably also had to return your signing bonus, right? (I'm at fb in new york btw. Also this still seems pretty high to me, 315k total for an E4. 150k base is the higher end of E4, so how many RSUs did you get?)