I can see this option actually applying to non-social ideas as well though.... I would like to "follow" certain collectors for comparisons sake.... There are plenty of people here who I could use for measuring up my collection and also use as a reference for games I may not have heard of as well.... If there is a Shmup collector that has a title I have never seen before then I would be likely to take a look at said game if I was in the market for new shmups for example....
you could use the web browser to bookmark their page.....
While this is fine for a single user home PC, there may be situations where that solution is not ideal....