I just rejoined Bebo in an attempt to feverishly dig up photos for a friend's Hen Party and Hey! Guess what! Bebo's still around, first of all. Second of all:
Bebo added those buttons for YOU so YOU could fully empathise with a friend's posting. As long as you wanted to empathise along the lines of "Cool!", "Funny!", "Sorry!", "OMG!" [which is how I want to empathise with everyone who has evidenced activity on Bebo inside the past three years] or "Agree" [What?]. No "FFS" button yet added but watch this space. Bebo has proven itself to be a constant innovator in the past so it can only be a matter of time.