About Estates,
First, second, third and fourth. Fundaments of society, they are, and function. Reality.
Fifth, we have trouble here: question mark. Narrowing my meaning of trouble; 'tis not trouble at all, but a question. A question is troublesome, because a question is a compound event. An event what is understood or comprehended invites obstacles and patience, troublesome. I do not want to dwell in to this matter more deeply, takes too much time right now, hence my usage of words.
Commonly I understand under the fifth estate which is after the fourth estate, which is ie. media in a sense. The fifth estate on the principle how estates work, should keep an eye out for the precedent estate. Which in order keeps an eye out for the previous estates and reports it to the third estate and vice versa. In a simple way the fourth estate does the communication between the first-second-third estates. From this perspective it has a monopoly power over the communication, it may distort information for other purposes and needs of itself, in the end it is ran by humans. In the end it doesn't breath, but it does live.
The fifth estate therefore is the guardian of the guardian on the slippery slope what we call communication in the end. Reading common thoughts on google, fifth estate representatives are bloggers, independent journalists, whistleblowers etc.. (by this logic). The flaw of the fifth estates comes from its nature, it is part of the media. The platform of the media gives it space in which it can operate. Hence it is part of the fourth estate. Figure out what this means.