
Similarly, many of us are very aware that it is increasingly expensive to acquire new users. In fact, instead of

It can definitely be frustrating: not only do you have to think about your ideal audiences, you need to think about how your competitors are eyeing those same audiences or keywords.
One good way to identify alternative audiences is to look at the traffic from your existing users. Google Analytics has added their new Demographics and Interests information and that could be explored for potential audiences.

Sometimes it's handy to price out the cost of different audiences before going into a planning/brainstorming meeting. That way you can highlight numbers around the obvious audiences and focus the group's creative energy on coming up with alternatives.
I sometimes take a “long tail” approach and find smaller audiences/keywords that don’t necessarily have a high traffic numbers but that are relatively inexpensive. You’re not necessarily going to get a big bump in daily numbers, but you’ll have an efficient spend and that additional traffic never hurts.
In any case, the "good old days" of cheap online advertising are over and we're now competing in a crowded space for a finite number of users.
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