Advertising on social networks: options?

Simple but enlightening article socialmedia Examiner, " Should you advertise on Facebook, LinkedIn or Twitter? ", which reviews the three advertising platforms and compares them according to the type of use that is designed to make them.

Its recommendations are basically:

• Facebook: for business of any size and any budget, with prices still low, with very good potential demographic and geographic segmentation (in urban areas and cities especially) when we turn to an individual consumer, not corporate, and use very common to get fans to the page of a company within the platform
• LinkedIn: the exact opposite, very effective advertising to businesses and the corporate world because of the abundance of high quality information in this area and the ability to target campaigns based on position, duties, qualifications, experience or membership in groups.
• Twitter: At this time, experimental and only available to large companies, but with significant potential for issues of high relevance and temporal context. As with the regular use of Twitter, the ability to launch waves of attention to one particular topic, an agile and quick. A few days ago we commented in this regard data using the experience of Banesto , the first Spanish company to try Twitter Tools.

My impression? First, the experience is a plus, and we talked about ways to advertise that they are beginning to be defined and where its own knowledge and not through the issue can result in significant competitive advantages. Frankly, I see this type of advertising being run by agencies, but as something the company has to manage directly, fast and agile management, testing different segmentations, and a high information environment that enables direct management. And certainly, in combination with other methods, such as Google Adwords / AdSense, traditional display advertising, etc. for combinations that will also satisfy, evolving and constantly changing.

"Experiences that you can or want to share in this regard?