And what do you mean by 'idea bubble'? Google turns up nothing,
Really? hmmm wonder if I misheard the term form wherever I learned it.
Anyway, basicly once google knows you're a conservative, it's going to give you conservative news sources; if it ever finds out your an anti-vaxxer you're going to get all the evidence proving your position; once you get a slight imbalance of run of the mill swj, atheist, democrats on r/politics, stories that panders to their interests is going to be upvoted until anyone else leaves; basically its when a filter of any sort begins filtering not based off the truth of what's said but rather the position it's taking. While I don't know if your could actually fix such emergent property of lazy thinking; I'd like to see it tried.