Yes, but the "implied contract" when, say, you go to Wal-Mart and buy a bag of chips (and we'll say paying in cash, since debit/credit both actually do involve a 'contract' signing of sorts) has much, much clearer consent than this social "contract." The express purpose of going into a Wal-Mart, picking up a bag of chips and going to a checkout line is to buy the chips. Assuming I wasn't coerced into any of these actions, my active choice to perform these actions clearly indicates consent.
This is quite different from the social contract argument, which essentially says that you consented to the government/society/etc. in which you currently find yourself by your continued existence there. The key problem is that you do not consent to your place of birth. The initial action that allegedly "gave" consent was something over which you had no control. That's not consent. Continued existence there cannot even be said to be consent, either, since there may be circumstances preventing your departure (a lack of financial resources to make the move, for instance).
Now, again, none of that necessarily invalidates the argument itself, but it, in my view at least, very clearly demonstrates it is not a contract, hence my request to have the argument renamed.