[ARandomerDude]

"Best phone" is clearly subjective.

"Doing everything we can" is at least somewhat objective. If a contractor says he's painting your house as well as he can, when he's actually on vacation in Hawaii, that statement is clearly false.

[im3w1l]

As long as facebook remains online there is a chance that someone, somewhere could post bad opinions. Doing everything they can would therefore mean shutting facebook down. The literal interpretation is ridiculous and no one could believe it. So we have no choice but to interpret it as "doing everything reasonable that they can". But what is reasonable? That is where subjectivity enters.