Now that you mention it, I haven't seen it for a while either.

Why i don't see any +1 in my google? Is there anything wrong with my browser or settings? how do i activate it?

I don't see anything at my side too. How does it work for seo?

I have not seen Google +1

It was heavily criticized before it even hit the road.
Surely it was re-shelved for a better test of the market fever.