Try out respecting Do Not Track header.

When enabled, expect in IE that violates the spec, we
disable Google Plus button, Vimeo videos and
Google Analytics.

Google Plus Button and Vimeo videos iare shown as
plain links. Other services state they follow DNT,
or never have set tracking cookies. E.g. Gists are same
for everyone, Facebook requires that login on their
site.

This does not protect visitors from 3rd tracking, if they
transparently violate DNT. Servers
can still collect information, but we specifically do not
get any information about you and it disables
tracking cookies.

And even if you allow tracking, we do not collect any
information that allows us to identify you. We for instance
do not collect full IP addresses, other than for account
validation purposes. IPs are not kept on our servers.

As such we may roll Google Analytics itself back in
regardless as its used for anonymous tracking. No
accounts or IPs are associated with requests.

DNT currently does not affect any served ads. Ads are
still shown.