Bridging cultural differences is fundamental in Barcelona. Muddling Catalan and Spanish words in the same phrase is a grave insult to defiant Catalan nationalists, and knowing whether to kiss or shake hands with business acquaintances can be daunting. Team building activities are an increasingly popular way to break the ice between work colleagues. Barcelona is well established on the conferences circuit, attracting a number of foreign multinationals and corporations who come for company incentives. In 2006, the city received nearly 500,000 conference visitors.