No way. :)

I use these services in different contexts.

When I'm relaxing and looking at Instagram, the last thing I want is a business article from LinkedIn or a political diatribe from Facebook.

In fact my primary problem with Facebook is that it tries to be everything to everyone.

Yes, Facebook tries to be everything to everyone. It kinda has to, more or less, for the sheer number of users.

Nilay Patel recently argued that Facebook is the new AOL, it's the portal of the 2010s. I think that is an apt description. I am using it yet also kind of just pining to drop it.

I also use it for groups and messaging. Somehow, Facebook groups are great. They're super simple, and they just work. The newsfeed on the other hand is completely broken.

Not OP, but no. I would never use an aggregator. I really don't want to view any of those services at the same time. They are all very different and require viewing at different times/different states of mind.

I am the aggregator.

And I like it when it's tedious.

Yes, I would as long as it's a natural river in chronological order.

Not saying this is what people would want, but what if the aggregator shaped itself depending on what the person was doing, where they were, time of day, etc?