Some scams are on Facebook but it is safe if you don't press them
A virtual pet app. It is safe
There are lots of flash ads all over the page and it takes a long time to find the answer you are actually looking for. I recommend using Yahoo Answers instead.
Sometimes I find Yahoo ads a bit suspicious so I don't recommend clicking on them. Other than that, it is just a normal search engine.
This is a secure site which belongs to Nintendo, creator of the DSi.