Looking ahead to their long-awaited IPO, Twitter is looking to follow Facebook’s lead and launch an exchange similar to FBX that would let brands retarget people who visit their sites with ads on Twitter. At this point it’s unclear how far along Twitter are in building this exchange, but they’ve already met with several FBX partners who are well versed in the field of brand retargeting. Twitter would also like brands to buy directly on the exchange , and are already in talks with major brands to make this service a reality.