Why handwritten direct mail is a very effective B2B sales tactic
Sure. Social Media is important – but not as important for B2B customer acquisition...
Thus it is hardly surprising that even B2B marketing experts are extremely skeptical of lead generation through social media tools. According to a Survey among more than 500 pay per lead advertisers, which was conducted by Business.com, two-third of the participants preferred classical outbound methods – live events, trade shows, inside sales or telemarketing.  Nearly three-third used digital content marketing and social media sharing, but only 22 percent described the strategies as effective. Customer testimonials and case studies were regarded as most efficient.
Email marketing doesn't work with decision makers
So it seems that promotion via social media doesn't leave a mark – the same goes for emails. Getting in contact with the leadership ranks isn't easy, and modern technology doesn't improve the process because being technically within reach doesn't mean that the receiver will be reached emotionally, and that he will react: According to InsideView, 92 % of the first management rank NEVER respond to mass emails or cold calling. 
“Stop sending emails, write letters instead.”
This is why the prominent business coach Andy Bailey recommends the following: Stop sending emails, write letters instead – on real paper and by hand.  A carefully crafted and well thought trough letter makes the sender stand out out. It is physically tangible, can be touched, pinned above the desk or kept in the planner – and will be remembered definitely. Handwritten letters are rarely sent anymore, which is only part due to the digital revolution. Bad handwriting, a lack of time or idleness can be reasons as well. And according to Bailey, a lot of people also have forgotten how powerful the handwritten word can be.
Reaching a higher response rate by sending handwritten letters
No one wants to waste their time by sending messages that go nowhere.
So how do you get people to react? The handwritten letter can be of tremendous help when trying to engage the people you want to reach, as the success story of the Danish mortgage Bank BRFkredit shows. BRFkredit had problems reaching customers who had financial problems, since this group of people is known for not opening letters because of the psychological distress it causes them. When the letters start to pile up, debtors tend to develop a certain fear of window envelopes.
BRFkredit found a solution for this by replacing their usual envelopes with simple white ones without their logo, the address of the recipient written in handwriting by one of their employees. As a result, they achieved an unparalleled response rate of 90%. So by using this method, BRF states that it was able to bring the home-owners it addressed back on their feet, because engaging with the bank saved them and the bank between 100 and 150 million Danish Crowns (18-27 million USD) – a true success for all the involved parties. 
Taking time shows appreciation is a winning strategy for life.
The distinctiveness of communication by letters starts with the act of writing itslf: While wielding a pen, you choose your words very carefully, since there's no button to erase them again. That's why letters are written much more diligently than digital messages. We like sending emails and only notice after sending that we pushed “Send” much too hastily. A letter demands time and patience, the writing process decelerates. And the fact that you took time for somebody shows appreciation – which is also felt by the recipient.
Your digital private secretary takes care of the paperwork
But what if you can't find the time for handwritten letters in day-to-day life? If it's not possible to write all the letters or cards you'd like to by hand because of the huge workload? There's no need to miss out on all the advantages of the handwritten letter, because this is where Pensaki steps in. The digital private secretary takes care of making the personal message a reality – in a natural looking handwriting. Thereby the essence of the classical and social paper medium comes to life - “emotionally charged interaction”.
 Why Social Media Is Overrated For Lead Generation | The Sales Insider
 How to Gather Insights on the Social B2B Customer | Work, Informed.
 Andy Bailey: Why You Should Stop Emailing – and Write a Letter Instead
 Persuasive Writing Social Influence Consulting Group