can't access facebook mac osx 10.7.5

Hi,

None of my browsers will load more than one page of Facebook. Firefox won't load it at all, Safari will load my personal page, but not any business Pages I own, and Chrome also will only load one or two page loads before timing out.

It does show data transferring when I pinged it (results below). Also, my PC on the same wireless router can access Facebook just fine.

I've tried clearing cache, restarting, adding DNS 8.8.8.8 and the two others starting with 212 that are recommended elsewhere. This worked briefly but eventually the connection was lost again. I also tried the instructions to use Terminal to create a new Host file. Didn't work either.

Ping Results:

Ping has started…

PING facebook.com (173.252.110.27): 56 data bytes

64 bytes from 173.252.110.27: icmp_seq=0 ttl=240 time=88.033 ms

64 bytes from 173.252.110.27: icmp_seq=1 ttl=240 time=91.949 ms

64 bytes from 173.252.110.27: icmp_seq=2 ttl=240 time=91.028 ms

64 bytes from 173.252.110.27: icmp_seq=3 ttl=240 time=90.407 ms

64 bytes from 173.252.110.27: icmp_seq=4 ttl=240 time=91.300 ms

64 bytes from 173.252.110.27: icmp_seq=5 ttl=240 time=91.399 ms

64 bytes from 173.252.110.27: icmp_seq=6 ttl=240 time=89.199 ms

64 bytes from 173.252.110.27: icmp_seq=7 ttl=240 time=90.529 ms

64 bytes from 173.252.110.27: icmp_seq=8 ttl=240 time=91.565 ms

64 bytes from 173.252.110.27: icmp_seq=9 ttl=240 time=92.026 ms

--- facebook.com ping statistics ---

10 packets transmitted, 10 packets received, 0.0% packet loss

round-trip min/avg/max/stddev = 88.033/90.743/92.026/1.204 ms

It seems like it's a settings issue with my router, perhaps?

Any ideas appreciated. Thanks