Without a doubt, and as we have mentioned in the previous answer, social media and advertising and marketing fit together well. Even though social media are quite generalist (restricted to professionals but not to sectors or countries), the user has the "obligation" (in order to get the most out of their use of the network) to define themselves and their area of expertise. This allows network managers to segment their database extensively (so that we can, for example, select users who live in Spain, are bc data brazil specialized in online marketing, work in companies with less than 150 employees and are interested in CRM-related products). This segmentation is very interesting for marketing and advertising agencies that can target precisely the segment of users who may be interested in their products and messages.
As this is a relatively new sector, both social media managers and marketing agencies need to work and learn more about new ways of working together for the benefit of all three parties involved: the social network, the marketing agency and the users themselves. In this sense, agencies are starting to use professional social networks to create opinions about a client or product (using forums, communities or user-shared agendas), to show their expertise in certain fields (participating in forums and answering questions, using the Expert service on Viadeo, etc.).