This is a problem to the extent that social activity online exists entirely within G+ and Facebook, which is why, as disgusting as it often is, a place like 4chan has real value. The online world can’t be subversive-free.
Imagine you’re walking down the street and you say out loud, “Down with the government!” For all non-megastars, the vast majority of people within earshot will have no idea who you are. They won’t have access to your employment history or your social network or any of the other things that a Google search allows one to find. The only information they really have about you is your physical characteristics and mode of dress, which are data-rich but which cannot be directly or easily connected to your actual identity.
…On the boulevards and town squares of Facebook, you can’t just say, “Down with the government,” with the knowledge that only a small percentage of the people who hear you could connect your statement to you…The pseudonym advocates note that being allowed to pick and choose a different name solves some of these problems. One can choose to tightly couple one’s real-world identity and online identity… or not. One can choose to have multiple identities for separate networks. In the language we were using earlier, pseudonyms allow statements to be public and persistent, but not attached to one’s real identity.