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?
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: