Hi Melinda Orr,
Yes this is available through ShareThis. Here is the following tutorial on how to add it to your Ning Network:
1. Go to www.sharethis.com
2. Under "Get the Button" click "Get it now."
3. Under "Step 1. Platform" select "Website"
4. Under "Step 2. Style" select "Bars"
5. Under "Step 3." Add your services and then click "Finish Get the Code" in the lower right hand corner.
6. In the upper right hand corner click "No Thanks, just give me the code"
Hope this works out for you,
Thanks Jords, I always wanted to know how to put the ShareThis bar in Ning.
You may or may not be interested in this new system which allows you to create badges for your website... (beta testing right now). You can see it on this website: http://mediacreations.co.nz/ on the right side.
It also has sharethis, built-in... but this system, has 2 levels of virality with embed and I am building a system which allows you to message all of your "Collectors".
I just wanted to thank you for that tip...it worked great!