How To Search Someone’s Timeline On Facebook’s Website:-
Desktop Instructions
- To search someone's timeline on Facebook, go to their profile. 
- To open a new menu, click the three-dot icon on the right side of the screen. 
- Select the 'Search' button with the magnifying glass next to it. 
- Enter the search terms you want to use. 
- Select "Search This Profile For..." 
- A new page with your search should load after you wait. 
Mobile Instructions
- To search someone's timeline on Facebook, go to their profile. 
- To go to a new page, tap the icon with three dots next to the "Message" button. 
- Click "Search." 
- Whatever you want to search for, type it in. 
- Click "See results for."