http://bentasker.i2p/posts/blog/software-development/dont-require-users-to-provide-valid-phone-numbers.html
As well as being subjected to a barrage of abusive tweets and messages, the victims Were sent deliveries of unpleasant and embarrasing items (including live insects, a fetal pig, and the book "Grief Diaries: Surviving the Loss of a Spouse") Had a funeral wreath delivered Had Hustler: Barely Legal delivered, in their names, to three of their neighbours addresses Had their property vandalised Were followed by the harassers, who'd travelled across the country and rented a black van for the purpose Were doxxed...