Can someone help me with twitter?

[Grace]

I decided to join twitter yesterday normally i just use facebook but twitter is all ive heard about later "tweets" but i don't get it at all im so uset to facebook + people always tell me there following the celebrity's confused! How do you know if its the real celebs page seens as there are so many fakes out there and how do you know if someone has left you a comment :| Im so clueless Loll!