Do you stalk your exes in social networks?

Back in the 90's when there is no Social networks yet, You won't find any news or updates about your ex. Then somewhere in the late 2000's Social Networks existed. Friendster and Myspace started it but Facebook revolutionized it.  I have some friends so secretly visits the Instagram,Facebook and Twitter accounts of their exes just to know how are they doing. 

If your ex gave you a friend request, would you accept it?