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Facebook, the world’s biggest social network, is selling more ad spots to big companies like Wal-Mart Stores, Procter & Gamble and PepsiCo.

But the site’s pages are also home to countless ads from smaller companies that can be funny, weird or just plain creepy — those suggesting you are, say, eligible to get a free iPad because you are exactly 26 years old, or entreaties to see what your offspring would look like if you had a child with a celebrity.