What is stumble and HOW did I get 300 UV from it in one day?

OK, just checked my google analytics, and it said I got 321 UV in a single day from stumble - Now, I have never really did much stumble, mainly because I hav eno idea what it is. And how did I get 321 UV in a day, without even signing up for anything?

Thanks

P.S - I am NOT complaining lol, just want to know

 

stumbleupon is a social tagging site...it's quite nice, you should use it too. The visitors came to your site because someone who visited your site liked it and gave it a thumb up (or "stumble" as most people call it). Then stumbleupon sent you some visitors and some of them probably also liked your site and thumbed up
hope this helps

 

Someone else submitted your site.
That means your content is good

Keep up the good work!

 

Yes, I'd like to echo this.

Seeing that you probably have viral content, you may want to sign up and submit some of your other pages to get the ball going (don't do more than that though, then it becomes a waste of time).

 

Stumble is good for getting your viral traffic up.