If you an ebay user and want to let others know what happened to any transaction of yours post your extensive story with all details of the transaction. Eliminate untrustworthy ebay merchants by stating your point.
Reveal the truth about the mobile phone deals and unfair charges applied.
Post a complaint or write a compliment about anything what happened to you while dealing with any company in the world.
Fight with unfair parking charges or public services provided by councils, management companies, estate agents, etc.
Make a funny comments about the operating system you use and in what shape your computer infrastructure is.
Share your customer reviews with others to promote good and reliable companies and discard those who should not be on the market.
Point out difficulties you might have experienced while using online services like internet shops, nuisance emails, spamming websites, malicious software.
If you decide to post a business review you allow other customers to learn by your experience and make their decission about dealing with this company more careful.
Add your customer reports on public transport.
Customer complaints are a powerful tool and ususally result in a response. This can only work miracles if used by the customer service managers in order to improve the services provided.