Make a funny comments about the operating system you use and in what shape your computer infrastructure is.
By writing your review you not only try to stop mistakes and bad attitude towards customers but also you raise your voice on the future of reviewed company.
Tell others about your experience with banks what problems unclear charges cause and how difficult is to get a support when you really need it.
Find more about a company you are planing to buy from or use for services and spend some moments on reading before making up your mind.
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.
If you are looking for information before buying or searching for a reliable supplier just browse and search for any positive feedback.
Share your opinions about so-called 'fair use policy' used by internet providers. Make a comments on what concerns you with regards to it.
Review night clubs you have or have not had a good time in. Post a comment on good food spots, restaurants, cafes, etc.
Describe in details your experience with any company and allow others to avoid them in the future.
Do post a positive review when you want to thank for a service or good customer service and dispute it if you think otherwise.