There is of course the biggest online brand Google, offering the Google
AdWords advertising network, that can complement their Google AdSense program.
You can even tie together the income you generate from Google to use for
advertising with Google.
If you are using Google or any other advertising
program, you do not need to stick just with the one, in fact implementing an
integrated marketing campaign with more than one agency may be more beneficial.
Remember, you can always change marketing agencies if they are not working as
well as you hoped, provided you have not signed any contract that locks you in.
Of course the other side of the scales is
generating income, that makes for a balanced marketing and revenue stream.