Facebook Inc. said Wednesday it is teaming with a Middle Eastern digital advertising company as the online meet-up site looks to capitalize on rapid growth in the Arab world. Facebook said it hopes the deal with Connect Ads will give it better exposure to advertisers in a socially conservative region where online marketing is in its early stages. The Cairo-based advertising booker already handles sales for Microsoft Corp.’s MSN regional portals and other local sites. The tie-up with an outside ad sales provider mirrors a strategy Palo Alto, Calif.-based Facebook has used in other emerging markets, such as Eastern Europe and Asia. It also signals the potential the social networking site sees for the young and growing Arab market, where it counts 10 million regular users. The company expects Mideast user numbers to shoot significantly higher in the coming months, as it has in other markets, as more members follow their friends onto the site. For now though, the Middle East represents a small fraction of Facebook’s business. The company has more than 400 million active users worldwide. It says about 70 percent of those are outside the United States.