Anne's words couldn't be any truer now: You now must consider whether this business you're about to like is going to spam you with tons of offers too. Is there any way to prevent the businesses themselves from abusing this new tool? Facebook isn't saying.

Furthermore, this is a sea change in how Facebook displays ads. Up until now, the news feed had been the last bastion of ad-free bliss on the social networking site. That is now gone, and I honestly don't see how, in the not-too-distant future, Facebook starts adding other types of ads to our feeds.

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