Like4like.org offers free likes to your page if you like their sponsored pages. It takes upto 5 seconds to open and like a page if you have fast internet whereas it takes up to 30+ seconds to like a page if you have slow internet. They will provide some points each time you like any page and your points will be debited each time someone like your page through Like4like.org. At start, it looks safe and reliable because you're getting many likes without paying a penny or doing promotion. But after few hours or days all the likes you got will be gone. Your page likes will return to the same number as before. Same happened with me. I liked a ton of pages through their links and received almost 100+ likes on my page but after 2 days all likes were gone and my page likes were returned to old numbers.
I don't know how all the people unlike my page suddenly, It can't happen. Even if someone unlike my page after sometime then still it may take up to few days to get my page unlike from everyone. So my trust on Like4like.org is now ended and I stopped using this website.
I would suggest not to use this website as you have to like a ton of pages for getting likes and then you will be irritated with their continuous postings on your timeline. It is more better to get likes through inviting your friends and using Facebook promotion scheme.