Use ShareThis buttons, Google's +1 button, bookmark button, etc.
Twitter, Facebook, Digg, Delicious are some of the buzz words on the internet. Setting up your business profile on these as well as on similar websites is the starting point. Maintenance, update and optimisation are also important.
See Why your business needs a blog.
based on Peter Kim's research
+ miscellaneous sources on the internet
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Use these services to check whether your brands/aliases are still available on social networks:
Find all the websites your competitors have links on, and try to position yours there too.