If so-called cyberjihadis want to launch another social media attack on America's military, they will have plenty of targets: the U.S. Army alone lists more than 2,000 links to feeds on Facebook, Twitter, YouTube and other accounts.

In the wake of Monday's breach of U.S. Central Command's Twitter and YouTube feeds by apparent sympathizers of the Islamic State militant group, U.S. officials updated passwords and some distributed advice to colleagues on how to bolster online security.

But they showed no sign of shifting a social media strategy that has seen thousands of Facebook, Twitter and other accounts blossom as the world's most powerful military establishes an Internet presence that matches the global reach of its forces.