Facebook and Pinterest.
Nascar.com, Joe Gibbs Racing.com, Accuweather.com, Ebay and Amazon.
I love YouTube and Pinterest.
Facebook, reddit, quora.
I use www.slitherine.com/forums quite a bit as I beta test games for them. Really don't have time for much on other sites.
Google (The greatest search engine)
Facebook (open options, quick access, many great friends i have around the world and staying update about any news i like to involve)
Youtube (Best video gallery so far in my opinion)
Linkinpark.com (My favorite band)
Twitter (Interesting and varied however i'm not using it anymore)
Amazon (Great online shopping source)
ect . . .
Facebook, NASA.gov, dictionary.com and thesaurus.com
I like myLot.com, Amazon.com and MSN.