Why would anyone want to buy Twitter? Sure they have a great brand, loyal fans, but pretty much no way to monetizing them. It's pretty obvious that Twitter has access to tons of interesting data, I just question if it's anything more than simply "interesting". While Twitter is huge, it's not really ubiquitous enough that you can use it for measuring things like effectiveness of marketing campaigns.
I totally see someone famous buying Twitter just to own it, or another company like Disney who just wants it to break-even. It has cultural and influential value now separate from profit.