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After running some ad campaigns on Facebook I am not sure its as good of a platform for advertisers as everyone makes out. Sure you can target very specific demographics of people, but i found from my (admittedly limited) tests that you could get a lot of likes and comments but very few people actually clicking through to leave Facebook and go to your external links. So it might be ok if your goals for your ads are to increase brand awareness or get interactions on your Facebook fan page. But if you actually want to get the people to leave Facebook and got to your own web site it is quite poor platform and I found Google ads are better as you only pay for actual clicks to your site.