Are you on Google+? If so, how often do you get a notification saying that some complete stranger has added you to their Circle? Then what do you do? Block that person or let him/her be?
Continue on if you are not sure about what to do, or unsure what the implications are when that happens.
What if you are not already on Google+, but want an invite? Feel free to post your Gmail address in the comments and I will send you an invite (I won’t be making comments with emails public, and will be deleting them afterwards, so you won’t get spammed).