Good social networks MySpace Google Plus+ DeviantArt LiveJournal Tagged Orkut CafeMom Ning Meetup myLife
I recommended Instagram because for its 100 million users. Although Instagram is a image sharing social platform but it have also business value. It eliminates the clutter of other social networks listed and highlights your products and services in a very visual way. So you can recommended this one as a good social media site for business. Have fun. Thanks !
there are many social media networks are available but the few best that i have use are there : * Twitter * LinkedIn * Goolge + * Tumblr * Reddit All time best network
I see you didn't include G+, so I highly suggest you to be more active on G+! G+ has a huge impact on SEO, so it would be a wise decision to build authority there too, especially if you have a site or blog! Another thing is that your posts on G+ can affect on people who follows you and search for certain keywords on Google itself! If they are logged to G+ during the search your posts can be positioned on their first page on Google! Of course the same keyword they search for need to be incorporated in your post!
There are a couple that I will suggest that have been mentioned because I feel they are very much needed to keep track with popculture. Google+ Linkedin Instagram Than you have the one's that are big but you would never think to gain traffic from, but are actually good source of traffic. Yelp Vimeo QZone DeviantArt GoodPixie There are several others but have allready been mentioned such as pinterest, hi5, myspace.... etc.
Facebook, Google+, LinkedIn, Twitter still ruling the roost and serves as the best social networking sites.