Why do digital media professionals create portfolios of their work?

Two technicians are discussing the common u-joint. technician a says its input and output speeds should be equal. technician b says that it normally has two yokes. which technician is correct?

What percentage of companies is projected to use social media to locate new employees in 2012

You have a small company and want to keep your costs low, but it is important your employees share data. which network would provide you with the most economical solution?