Zuckerberg's New Home -- You Paid $7 Mil for That?

Facebook honcho Mark Zuckerberg just dropped $7 million on a new pad in Palo Alto ... and it's nice and everything ... but $7 MILLION ... REALLY?

The 5,000 sq ft home includes a saltwater pool, glassed in sunroom, outside fireplace, 5 bedrooms and 5 baths ... but no apparent grotto, helipad or batcave.

So we gotta ask ...