How to check traffic?

Started a blog close to two weeks ago. Traffic has gradually been increasing but at a rapid rate.
Last few days i have been sitting at 450 UV's (+/- 50) yesterday i got just over 1,000 UV's.
All my traffic is coming from social networking sites, well that's what i think. Is there anyway i can check?
Maybe someone is spamming my site, i'm not sure.

Any help would be appreciated!