Email marketing seems as old-fashioned compared to social networks. I think email provides the most direct line of communication. Do you agree or not?

Email Marketing is old but can't be ignored.
Email marketing is best way to reach targeted customers.
WE can market all of our channels at the same time in Emaill Marketing like Services , website , social media links , offers etc.

Email Marketing can provide best ROI especailly in B2B.
If the database is targeted.

E-Mail marketing is old but this is the best way to get in touch with your prospective consumer as the wastage is low.
Agreed that social media is popular but i personally feel the medium is not that much usefull as far as ROI is concerned, as the need & purpose of visiting social medium platform is different by the user and some how they are mentally positioned o get themself exposed for doing some business.
  But still selection of media tool totally depends on the defination of TG7 communication message.
i will agree with Abdul that E-mail works well for B2B client.
 

  If someone is saying Email marketing is dead! - It’s not! Still it’s the most effective way to get direct responds from your client; it will build a responsive audience of clients or customers for your business.
It’s the strongest form of content marketing approach; it’s powerful It’s so powerful because it’s something which is attached so Much with your ‘INBOX’ Email marketing will moves the conversation about your business or information product to a more personal environment and you’re doing it with the” permission” that’s the difference.
  ROI- that’s the most attractive part of it- it always pays for itself; and it’s very cost effective way of online marketing- read more on my Blog-sharath-perso-b.blogspot.in

agree

Well remember Emailling is the firster to reply to any bussinees to compare to the network you can chat through email and bussiness done  

With the new gmail functionality where it has divided your email as primary, promotion& social, email marketing is going to see tough time. Though too early to come to a conclusion but there is an observed drop in the open rates in the email sent by the marketers. Its a boon for the users since he has a choice to check the email he/she wants.

for now, marketers are investing in email marketing to reach to the targeted audience since its the cheapest mode of communication.