By Ahmed Eljechtimi, Victoria Waldersee, George Sargent and Magdalini GkogkouAug 4 (Reuters) - Last week's rush of migrants into the Spanish enclave of Ceuta began with a trickle.Encouraged by a handful of viral videos, including some posted by a Spanish news outlet intended to highlight the burden of migration pressures, the movement of a few dozen youths quickly turned into tens of thousands swimming en masse by last Thursday.More than 80 people drowned or were crushed in a stampede, according to official tallies.

Some videos have racked up millions of views and thousands of comments in what has become a first-of-its-kind social media trend with dire consequences.

At least 72 people died during last week's mass influx of migrants into Spain's Ceuta enclave, when tens of thousands of people swam around the border post from Morocco, local…