LINKEDIN

Linkedin is the primary networking site whether for business, non profits, or consultants. The Forbes link is important to read if you have not used Linkedin.  Incidentally, Linkedin is also useful for those of us who are retired to keep in touch with associates who are not on our other social sites.

https://www.linkedin.com/

http://www.forbes.com/sites/laurashin/2014/06/26/how-to-use-linkedin-5-smart-steps-to-career-success/#359bf9956292

PINTEREST

Pinterst is a visual bookmarket and social media site all in one. You can create your own board of pins which you get from pages you like on the internet or update from your computer. There are way more uses for Pinterest than I can describe here. I suggest you try it yourself. It is quite easy to use:
https://www.pinterest.com/

An explanation of Pinterest:
http://www.theatlantic.com/technology/archive/2014/07/what-is-pinterest-a-database-of-
intentions/375365/

Pinterst for marketing:
https://business.pinterest.com/en/blog/introducing-pinterest-marketing-partners