How to add facebook like/share button to every new text I post?
Hope this will help you,
You can achieve this with two module views and facebook
after enabling both module go to the structure tab of drupal,click on this

put Fcaebook application Id here:



You can create application id from this link
on reference to ur facebook account.
Than inside Facebook social go to "Presets" 
click on add 
fill up this form


for like button put only the name and select radio button of "facebook like button plugin" and select your content type,
save the form,
Go to view to create a new view,

Select respective field of your node and below that select the "Node:Facebook Social plugin", on settings of this field put your preset name as below



Finally you will get the face book like button on every row of your view.