Search engine marketing campaign mistakes

Here is an interesting video about how to avoid some frequently SEM campaign mistakes. He is focusing on:
- poor training on SEM;
- your SEO viability;
- ROI strategy;
- choosing wrong keywords;
- half-hearted effort;
- link bait;
- social networks;
- limited content;
- ranking analysis;
- stuffing;
- holistic thinking;
- industry trends.