In the Activity Feed Section, if you want to look again for a specific contact, you have to scroll for more contacts to load (which takes a lot of time) and manually search through for the contact (control+F).
It will be way easier if you add an option where people could filter the period they are looking for (from date X to Y)- as well as search for the contact. In this way the whole period will load from the beginning, and the user will not need to wait and scroll for loading all the contacts (the scroll depth will also decrease as well as the time for finding what the user is looking for).