Question was: are we implementing “friends list” or “observing list”?

• first one would be connection between two users
• second could be one-way and wouldn’t require accept or something like that

@mlencki opted:

I opt for the latter option just because it sounds simplier.
Later, we could think about adding some "private profiles" functionality for guys that don't want to share their activity with strangers. So if you would like to observe private profile, you could click the 'observe' button and wait for profile owner to accept you.

I would design database/model/observers/whatever here and create controllers for that in another issue.