The leading libel lawyer Mark Stephens' piece for Gazette illustrates the dangers for bloggers within the UK.
As he points out, it appears that the site Holla Back which has been used as way to fight back against street harassers has just come to the UK.
The difficulty for sites likes these is that they may not appreciate the difference between US & UK libel/defamation laws.
As Stephens observes "In the US with its guarantees of free speech under the Bill of Rights and various state constitutions, it is almost impossible to bring suit successfully unless there is something deliberately or recklessly false in what was posted....In the UK, the tables are somewhat turned by our peculiarly claimant-friendly libel laws. These are libel laws that already bring into our courts into disrepute by attracting crooks, brigands and libel tourists -let's hope this will not include perverts too."