You can add friends to your Close Friends list to obtain an alert each time they upload. You can transform these alerts off any time.
Facebook Close Friends List
1. Go to their profile
2. Hover over Friends on top of their account
3. Select Close Friends
Keep in mind: You can add friends to greater than one list or remove friends from a list.
Method 2
1. Open the Facebook application.
2. Tap menu symbol in top right corner > Friends
3. In the Friends tab, touch the friend you want to add to the Close Friends list to view her/his Facebook web page
4. Touch the Friends button > Edit Friend list
5. Select Close Friends, and then touch Done.