Quite similar to my own mindset here; I too am frustrated with tool-bars for almost everything as well! This is what I assumed, I believe if people did want to interact socially they would do so on each individual social website rather than on an integrated toolbar - I don't even know how secure this can be for the visitor too! :scratch:
Some of the tool-bars can be integrated quite well but those that contain flashing messages or additional pop-up menus are quite annoying to me!
Ah yes, I do wonder what security issues they pose to the visitor - I did think that they would have to have some sort of tracking process attached to them. I just don't get how they can be so popular though and still in use, perhaps it's just the latest gimmick to have and makes you appear more user-friendly (to some) and more "in tune" socially.
It's interesting to hear the feedback thus far - all seems to be what I imagined but I'd also be really interested to hear any success stories from those of you who have used them whether on your blog/site or as a visitor!