Peeple, a new app currently in testing, allows you to rate and review other people without their consent - as long as you have their phone number.
http://www.theguardian.com/technology/2015/oct/01/peeple-review-people-the-user-review-app-you-didnt-dare-ask-for
It's such a terrible idea I can't believe it's got this far!
"To add someone new to the site’s database, you must have their mobile phone number. Positive reviews post immediately; reviews of two stars or fewer are sent to the subject’s private inbox, from which point you have 48 hours to “work it out with the user”: “If you cannot turn a negative into a positive the comment will go live and then you can publicly defend yourself.”"
Imagine being a young person growing up in a world where people think it's acceptable to create an app for this purpose!