This is actually a much better reason for boycotting than taking on some quixotic initiative based solely on principle (however honorable that may be):

the market has decided that FB is now the poster child for bad business behavior.

That is, it makes financial sense for (some) companies to disengage from the FB brand.

For a company whose business models rely on leveraging social network dynamics to sell more ads, it seems welcomingly ironic that FB should be labeled the social pariah, if even for a short moment in time.

(let's hope it sticks)