Difference in putting model in "bookmark" vs "friend"?

I am unsure if this is something obvious or not but to me it doesn't seem like it is.
When I want to "save" a model (follow her), I know to drag her icon to the sidebar, but on that bar is the option to put her in Friends, or Bookmarks.

What is the difference, or what are the main differences?
I assume maybe having someone on your Friend List would possibly give them more "access" to your profile? Or, maybe not? I truly don't know.

If anyone can enlighten me I would truly appreciate it.
Thanks in advance
 
When you bookmark a model it automatically puts them at the top of your Friends list and they are the first person you see on your Page.
I don't know but I don't think it gives them any more "access" to your profile.
 
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