What happens when you "like" a link on Facebook?

[Melanie]

If I like an article that a page posted, will that show up on my friends' feeds? Do I have to share it in order for them to see it or is liking it going to allow them to see it? In other words, will everyone know when I like something (be it an article, photo, etc.)?
So what is the difference between liking and sharing?

[Jess M]

It will show up on your friends news feed

[Ajwa]

Yes it will appear in you friends newsfeed

[NAeeM]

Yes either you Like or Share anything it will appear on your timeline and will also be visible to your friends.
Likes will be visible to all friends but you can control the shares, whether you want to share with a specific person or public.

In my opinion..................... like = your opinion
when you like any page, the posts of that page will be shared with you only, but your opinion will be visible to your friends.

and ...............Share = inviting others

for more clarification you follow the given links

hope that helps