Cute, but you’d really have to work to spend $3,000 on a Mac these days. The highest-end base configuration for a 27” iMac is $2,000, so you’d have to jam a whole bunch of upgrades to get there.
A bit easier if you have the 15” MacBook Pro with Retina display — the highest base configuration there is 2,800, so you’re only one or two upgrades away.
I got my iMac, Parallels Desktop, and 3 years of AppleCare for less than $1,200. I also do a lot more than just Facebook on it.