The grim task of searching for the scores of people missing from the devastating flood that struck Texas Hill Country nearly a week ago is taking an agonizing toll on searchers.

Various actors make celebrity-centered posts like these, which are common after a disaster, said Cliff Lampe, University of Michigan professor of information. These go viral because fans of celebrities want them to be seen doing good things, "which by extension means they are good people, too," he said.

NASA deploys specialized aircraft to assist search and rescue after catastrophic Texas floods that killed 119 people and left nearly 200 missing in South Central Texas.

The July 4 flash flooding has claimed the lives of at least 110 people, a toll that has steadily risen as search and rescue teams and volunteers comb through debris.