Sorry I misunderstood your point - you are right they don't have to. We don't want two sites doing the same thing. I think Twitter is doing a good job forging i

Sorry I misunderstood your point - you are right they don't have to. We don't want two sites doing the same thing. I think Twitter is doing a good job forging it's own identity, it is Facebook that seems to be borrowing ideas from everywhere else - Foursquare etc. I do think however that 'like' could be useful for Twitter and they could implement it in a different way. I take your point though.