This kerfuffle at the Smáralind shopping centre near Reykjavík, Iceland, last weekend isn't because One Direction are in town. It's because of two stars from Vine, the six-second video-blogging site.
There was quite a turnout - far more than the duo were apparently expecting.
Vine is attracting the bored, mobile-obsessed teenagers and young people that made YouTube a phenomenon less than a decade ago.
And while YouTube was, back then, a platform for people to view on PCs, Vine is by its very nature mobile-first, with web-profiles only going live this year (Instagram did the same last year).
There is a lot of collaboration and sharing among Viners, sometimes between three or more of them.