Paid digital advertising spent $23 billion in 2015 and reached 5-10% of organic content reach, so brands should post less but smarter on social media. Bruce Martin of Ginger Juice gives a Twitter case study where £100 advertising budget delivered 217,000 impressions and 5,000+ engagements through designed, prize-incentivized, and targeted tweets. He recommends using Twitter cards to boost posts and shares.