Rumor has it that Twitter is prepping an ad-retargeting exchange to rival Facebook’s.

The practice works by locating people on the social network who had previously visited a brand’s site and retargeting them with non-standard display ads in hopes of luring them back to the brand site.

While Facebook didn’t launch Facebook Exchange (FBX) until last summer, after its IPO, it’s looking like Twitter might take the reverse route.

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