What legal considerations are there when creating a wiki using MediaWiki for people to use worldwide?
For example, I noticed there are privacy policies & terms and conditions; are these required to safeguard me from any legal battles?
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Any considerations should depend on your business, business model, website functionality, and so on.
(We've blogged about the major privacy laws here: CalOPPA in the US, PIPEDA in Canada, DPA in the UK, Privacy Act in Australia)
A Terms & Conditions isn't required but it's extremely useful to have since your MediaWiki website will have user-generated content.
Example from wikiHow again:
As a starting point only, look into the following: