Answered by others.

...

> There might be competition on providing a nice "experience" but you would either pay for it,

... yes please

> have it be ad-supported

... our only choice with the current Facebook

> or it'd turn in to a Linux-desktop shitshow.

... and this is were you earned my downvote. Stop spreading FUD. Please! The Linux desktop is quite usable to the point were many of us prefer it over Windows or Mac.

> Imagine how much more fun spam filtering could be if it didn't have a dedicated team but it would just be you (or your grandmother) going up against the legions of determined spammers.

One word: whitelists

Another word: shared