Sometimes Wikipedia is right, sometimes it is wrong. Once I saw this on a page for "Kitty"
Kitty can refer to...
...
Kitten - A young cat, also known as the master of small pets they pur to atract a mate and wif that pur they make babys.
EDIT: I can't remember what the spelling and grammatical errors were, so I guessed what it originally said before I fixed it.
I fixed that one up a bit, and changed it to:
Kitten - A young cat, also known as the master of small pets [citation needed].
Since then, someone fixed it so it just says "A young cat."
For the most part, it's not too bad, but sometimes people do put up some weird stuff. Usually you can tell if something is likely to be true or not, because usually the falsest stuff on there is so stupid you can tell it's not true. And if you aren't sure, you can always edit the page to add in: [Citation Needed]!