The triangle resembles the Swiss chocolate bar’s unique shape. Social media users are showing off their Toblerone Tunnels, citing celebrities like Emily Ratajkowski and Katie Wright as inspiration.

The makers of Toblerone are stripping images of Switzerland’s famed Matterhorn and the Swiss flag from the packaging of the milk-chocolate treat as they move some production to Slovakia.

Mondelez, the US company behind Toblerone, has blamed higher commodity prices as well as increases in production costs for trimming the number of peaks in the chocolate bar, which is manufactured ...