What social media do you use to promote your business?

Here is my comment to the question posed by Socialwrites on Facebook –

My best as far as results & connections has been LinkedIn. I have said before that LinkedIn is my business phone book. I believe anyone that owns a business or works for a business should at least have a LinkedIn Profile so you can be found even if you are not active on LinkedIn. My last statement applies to professional business people as well as home-based or hobby business people. LinkedIn has groups on all types of topics including Facebook.
LinkedIn etiquette is different from Facebook, so you should observe a bit before posting. Feel free to visit my LinkedIn profile – http://www.linkedin.com/in/raybowyeridaho

I do also have: a Google + business page, a Manta profile, & a Pinterest business page among a few others.

SOCIALWRITES – Question of the day: After Facebook and Twitter, what do you think would be the next social networking site that a business, any kind of business, should belong to and become active in? Pinterest, Instagram, Google+, Linkedin? Another? Why?