Facebook added five real-time-bidding partners to its Facebook Exchange: Optim.al, Rocket Fuel, Nanigans, Criteo, and X+1, Ad Exchanger reported.

They join AdRoll, AppNexus, DataXu, MediaMath, Tellapart, The Trade Desk, Triggit, Turn, and Xaxis, bringing the social network’s total number of approved Facebook Exchange RTB partners to 14, according to Ad Exchanger.

Of those 14 companies, Nanigans and Optim.al are the only ones that are also Facebook ads application-programming-interface partners, Ad Exchanger reported.

Facebook Exchange allows advertisers to bid in real-time for ads on the social network.

Optim.al CEO Rob Leathern told Ad Exchanger:

We can confirm that we are part of the Facebook Exchange RTB beta program. We’re excited that this opportunity will extend the reach of our platform to harness the quality and scale of Facebook, while continuing to leverage our proprietary targeting data and tools.