On average, people in their twenties move employer every eighteen months. This slows when we move into our thirties. Is job hopping something that should be frowned upon, or does it make an employee more appealing?

Clearly, loyalty is highly valued by employers, but would you prefer a candidate with more depth and breadth of knowledge? 

As employers can no longer guarantee life-long employment, it is upto us to take charge of our careers to ensure continued professional development.