How do I get myself to focus when I'm working on my laptop?! I always...
Try not to log on. Or if you must check it them out,set yourself a limited amount of time so that you're not "distracted" for very long. You can get software for certain sites that block your access after you've been on for a while > it's called a Parental Control filter.A friend of the family has 2 kids and she has that installed to stop them spending so much time on social networking sites.
The best way would be to unsubscribe from twitter and stuff, that's if you are unable to multi task.