By Alexei Oreskovic SAN FRANCISCO (Reuters) – For the first time, Facebook Inc is letting users of its online social network identify themselves as a gender other than male and female. The basic user profile for members in the United States now includes a customizable category among the gender types that users must select, the worlds No.1 Internet social network announced on Wednesday, the day the feature became available for U.S. members using the sites English-language version. Until now, Facebooks 1.23 billion members could only select male or female for their genders, which Facebook requires users to state in their profiles. Users of rival Google Incs Google+ social network already had an other option for gender.