[tolos]

Yes, except for the tweet/+1/reddit/others floating bar.

[ZoFreX]

Adblock can do them too! You can either add them manually or subscribe to a filter that has them all already - I use "Fanboy's Annoyance List".

[dredmorbius]

RIP (Remove it Permanently) typically nukes those just fine, though you may have to re-nuke it as the page is redesigned and xpaths change.

[sliverstorm]

NoScript will take care of that, but it is a pretty big hammer.