According to Coupons in the News, Quotient Technology (the same folks that own coupons.com) has acquired Savingstar.
At one time, Shopmium, a now defunct rebate app, was also acquired by Quotient Technology.
Remember that I have said time and time again to not use the rebate apps as a bank and keeping large amounts of money sitting with the app because you never know when one may go under. At a minimum, withdraw your money, at least, once a month. For me, the last day of each month, I withdraw my funds.
However, as you all know, Savingstar is my favorite rebate app and I am definitely keeping my fingers crossed that great things will come from this acquisition, such as, adding more stores to link to loyalty cards for automatic rebates.