It depends on how much you want them versus how much they want you. If you can't attract them with just cash, you're going to have to give stock. Considering the Slinkset guys are hungry entrepreneurs who'd probably want a stake, and an all-cash transaction in 6 figures wouldn't make them f@#$-you rich anyway, I'd guess this was a most- if not all-stock deal.
It also depends on what Posterous's cash situation is like; if much of the 750k is lying around idle, they'd want to spend it, else they'd rather avoid having to raise money again, which would result in giving up even more equity. Plus, all else being equal, I'd rather share equity with cofounders/employees than with investors.
It also depends on what Posterous's cash situation is like; if much of the 750k is lying around idle, they'd want to spend it, else they'd rather avoid having to raise money again, which would result in giving up even more equity. Plus, all else being equal, I'd rather share equity with cofounders/employees than with investors.