Nkosinathi MahlanguWHEN it comes to job-hunting, social media can be a double-edged sword. For young people who have graduated or are looking for employment, there’s no doubt that having an online presence is important – some might even say critical.Not only can social media be a valuable tool in helping you discover career opportunities, it can also assist in your personal and professional brand-building. A survey among more than 2000 hiring managers and human resource professionals by recruitment site, CareerBuilder, revealed that two in five companies browse candidates’ social media…