Well, better name Rated 4 out of 5 stars
I always thought F1 was a great name for help, but not for sharing. Icon is better as well.
Firefox Share does what it says, but still lacks some of the accounts (but they promise they are coming). I'll not hold that against them, mainly because I don't care about Yahoo or a second Twitter. My only problem is that Gmail has not use of contacts. F1 had a messed up way of getting your contacts, although you had to delete out the name and brackets. Share requires you to fully type in the address. On the plus side, however, it adds the page title as subject of the email.
I also think it would be great if you were able to use this to set status on Facebook (not sharing a link). That would be above and beyond what is expected of this- like the cherry on top.
Can't wait for more services to be added, especially Google+. Looking forward to updates!
One last thing. I don't want to bookmark everything that I share. F1 had the option to disable this, and I hope to see this option in the next version.