
The search engine marketing (SEM) space is hot and growing hotter every day. The massive migration of advertising budgets from traditional channels to online marketing has brought many new players, and hoards of salespeople too.
Buying SEM services can be tricky in the best of circumstances, given how new and complicated the industry is. To make matters worse, guarantees are prohibited (to various degrees) by Google, Facebook, and Twitter. So how does a small business owner know a good SEM...