SteamFriends is a database driven website that produces stats on a steam players friends list.
How do you collect data
SteamFriends is piggy backs off the SteamID Database. so we have the ability to store large amounts of data and update it frequently.
Data is collected via the SteamAPI and using the power of the database we run we can pull back out stats and other information
Finding an old friend
While SteamFriends can be used to find old friends or friends which may have been deleted, it does rely upon the database seeing that friend on the list
If the site scans a steam profile and then after a friend is added and then removed before it is re-scanned they will not appear on this site because we have not seen it.
No Friends are loading
The steam profile maybe private which means SteamFriends cannot obtain this list.
This could also be down to network or server issues at the time but is most likely due to the steam profile permissions because
SteamFriends.us is not affiliated with Steam / Valve