HSG Alumni Our alumni community counts 28,877 members in 194 clubs across the world. The HSG corporate account counts more than 56,000 Facebook fans. Alumni members 28,877 members worldwide. 194 Alumni Clubs on 5 continents. Social networks *In 2016 the website and tracking method were revised. In 2017 the tracking method was revised again. The number of website visitors can therefore not be compared with the previous year's figures.