HTTPS connection attempts from Facebook?

[Michael ODonnell]

This is the second time this week that my firewall has reported
the following:

 [DoS Attack: ACK Scan] from source: 69.171.227.60, port 443, Sunday, August 05,2012 20:25:40

The reported IP address is within a range owned by Facebook
and DNS shows a hostname that (FWIW) is at least plausibly in
keeping with corporate naming schemes.

I do have a Facebook account and may or may not have allowed
a "session" to remain active overnight, though I'll claim
that shouldn't matter as I ask the following: is there *ANY*
legitimate reason why anything should be attempting to connect
from Facebook to my home IP address, which offers no such
services?  I assume, of course, that the answer is "No".