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One question that becomes very important is whether you are being positive or negative about the celebrities. If you are going to suggest that, for example, David Cameron had a gay affair with your...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/5878 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
One question that becomes very important is whether you are being positive or negative about the celebrities. If you are going to suggest that, for example, David Cameron had a gay affair with your lead character, then don't - you will get in trouble. If you are wanting to suggest that your lead character was at an official event that He spoke at, and talked to him about nothing significant, then you should be OK. Picking up @VictorGs comment, you could use meaningless meetings with current people to provide reminiscences about past ( and dead ) characters that they have met, which can be more racy/ controversial. I would suggest that there is a link on the blog that makes it clear that this is a fictional account - not necessarily prominent, but noticeable. Also, consider whether you would allow comments - probably not, unless it is critical to your project. YOu could get in trouble for comments that assume the blog is real, I think. Disclaimer: IANAL.