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How often does American Express do "special offers" like the 10% cash back on restaurants" that just ended on May 3rd...
They seem to always have the 100/150 back after X spend in 90 days kind of stuff...
Of course there's offers at their webpage when you log on that are directed at you. You can also find offers on Twitter @amexoffers after you sync your card. Some are great savings, but most are yawners.