As always, low cost airlines tend to be the innovators in this area, but
Today Twitter, Facebook, Flickr, YouTube and online blogs, offer largely unexplored new advertising and promotion platforms.
In principle, these sites enable airlines (and companies in general) to instantaneously and cheaply promote their product and brand, get the online community involved and motivated to travel, specifically target key market segments and develop brand loyalty to the carrier. It is also a way for carriers to promote word-of-mouth advertising, which is the single largest influencer when it comes to making travel decision, and, ultimately, boost revenue levels.
But much of the activity is experimental