user-generated content

United Kingdom of Great Britain and Northern Ireland. Great Britain means England, Wales and Scotland

not inarguable

'uncharted waters' is often used as a metaphor for anything new, untried, unfamiliar, and with the implication of unknown dangers ahead. 'Unchartered', however, is used less often, as an adjective meaning without regulation or laws—so best not to confuse the two.

United Nations Educational, Scientific and Cultural Organisation

not very unique or quite unique or any other qualifier. Unique can only stand alone because it means 'the one-and-only'.

short form is till, not 'til

you're up to date in your work, but work in an up-to-date way

the 'upcoming' Golden Globes means they'll be here soon. The 'up-and-coming' Golden Globes are becoming well known and successful, which is probably not what you mean.

Uniform Resource Locator, or website address

no punctuation