Is their a service or a way i can set my content filtering and have authorized individuals (Mom and Dad) bypass the blocked content? i want to block facebook for the kiddies but not adults, but block adult sites to everyone. can this be done with using OpenDNS or do i have to continue to use my internal proxy?

You can pay for enterprise-level service, or use an LPC-capable Netgear router. Of course, no service can differentiate between people, but between user accounts. It should go without saying that no one should be using an administrator or root/superuser account.

http://countries.netgear.com/lpc
See the FAQ for a list of supported routers.

This uses a different type of OpenDNS account. If using LPC, close your current OpenDNS account by opening a support ticket, or simply ignore it (but don't use it for configuring filtering, etc.)

LPC can provide differential filtering for Windows and OS X user accounts. All other operating systems are subject to one configuration setting.

Actually add the following:

127.0.0.1 facebook.com
::1 facebook.com
127.0.0.1 www.facebook.com
::1 www.facebook.com
127.0.0.1 static.ak.fbcdn.net
::1 static.ak.fbcdn.net
127.0.0.1 connect.facebook.net
::1 connect.facebook.net
127.0.0.1 s-static.ak.fbcdn.net
::1 s-static.ak.fbcdn.net

Works on both IPv4 and IPv6 connections.
The instructions in the hosts file for Windows says to make each entry a separate line.

Well, the file comments say to "make each entry on a separate line", but that just makes me question what MS considers to be an "entry". I would think that any domains being associated with a single IP can go on the same line (which works). For people who like to block tons of stuff via hosts, there would be some merit for maintenance reasons (and line length limitation) in keeping some domains one per entry (or grouped by some criterion).

But I think the instructional idea behind the MS comments (but who can ever tell, really) intends to point out that you cannot put more than one IP address in an entry.

Well, there is no sort of "account" differentiation. DNS IP settings apply to the system, not the user.

You could use something like http://www.eusing.com/ipswitch/free_ip_switcher.htm
installed for the appropriate accounts only.

Otherwise, you can look at a Netgear LPC router which does filtering in conjunction with OpenDNS, needs no updater, and can filter per Windows or OS X user account.
http://countries.netgear.com/lpc see the FAQ for a list of LPC-capable routers.

This is simply something that a remote service cannot do.