I deliberately follow people whose views (and even faces) I don't like on Twitter.
Their tweets can sometimes be hostile, racist, homophobic, and wishing for the death of others.
To me, they're a healthy reminder that thoughts that like that exist.
However, authorities aren't always the best judges of which tweets are merely the invective of the frustrated and powerless, and which are a genuine threat.
In a case that might give some pause before tweeting on the blurt, 21-year-old Alba Gonzalez Camacho has been convicted by a Spanish court of inciting terrorism via social media.