Updated 7/17/15

General Advice 

Public Relations:

https://www.gcaionline.com/digital-marketing-news/gcai-desk-produce-videos-pr-budget/
http://firstround.com/review/why-most-startups-dont-get-press/

Social Media Marketing:

https://www.gcaionline.com/digital-marketing-news/gcai-desk-social-media-knight-shining-armor/

Online Advertising:

http://www.ladderdigital.com/startup-growth-adwords/                                         

 Digital Marketing: