Please help me to concentrate! What are possible ways to stop being childish?

[Miss Brooks]

First: I can never concentrate on studying because of facebook/twitter pages or skype. I can't stand opening pages and twitting about my hard life or watching other people's photos and chatting with my friends.
What are possible ways to concentrate?
Second. I noticed that I can only make myself work hard if there is a person next to me who always panic and talks about how much she/he works for an exam, for example. But when there's none i feel totally relaxed. Like today: I have my exam tomorrow but I haven't started my prep yet... Am I childish and irresposible? How to change it?
Thanx

[Jimmy]

Once you realize what is most important you will get your priorities aligned.

[NullZone]

lol, just cut all distraction lady, it's called discipline, google techniques for self discipline..you'll thank you later