works fine for me on safari and ff
to troubleshoot:
open up the terminal.app and type
nslookup
www.twitpic.com
result:
Server: <your nameser IP or name>
Address: <your nameser IP>#53
Non-authoritative answer:
Name:
www.twitpic.com
Address: 174.36.58.233
then
ping -c2
www.twitpic.com
result:
PING
www.twitpic.com (174.36.58.233): 56 data bytes
64 bytes from 174.36.58.233: icmp_seq=0 ttl=52 time=154.149 ms
64 bytes from 174.36.58.233: icmp_seq=1 ttl=52 time=156.805 ms
---
www.twitpic.com ping statistics ---
2 packets transmitted, 2 packets received, 0% packet loss
round-trip min/avg/max/stddev = 154.149/155.477/156.805/1.328 ms