Demand is confirmed by the industry’s huge M&A activity. acquired travel search engine Kayak for $1.8 billion in November, and Expedia bought a majority stake in Trivago for $632 million a month later. TripAdvisor, the guides and user reviews site, snapped up travel start-up Tiny Post for an undisclosed amount last month. Many of these upstarts combine clever online marketing with smoothly-built technology to target travellers. Many are also taking advantage of the economic boom in emerging markets. On the other side of the pond, the potential rewards are even more enormous. In the US, $136 billion was spent on digital travel sales last year – an 8% increase from 2012, according to eMarketer. Throughout 2012, there was a 10% increase in online travel purchasing, according to Adobe Digital, while between 2009 and 2013, US travel sites banked $54 billion. Get the full story at BusinessBecause