"I will post your review anywhere you want for £5"
Need a good review of your book/product/whatever but obviously can't post it as yourself? If you write the basic review, I will post it under the pseudonym I use for reviews wherever you want me to. Ciao, Google Maps, Goodreads - anywhere. I may rejig it a little so it sounds like I've written it and, if English is not your first language, I will also tidy it up for you linguistically before posting and proofread for spelling/grammar etc.