Well, I can imagine google linking +1 with likes on Youtube, like/share/star On google reader, star on google groups and so on.
If so, it will also make google plus a lot more useful, as your interactions on Google+ already affect, in a positive way IMHO, your Google search results.
If so, it will also make google plus a lot more useful, as your interactions on Google+ already affect, in a positive way IMHO, your Google search results.
The privacy implications are enormous though.