an egg
... that an image of an egg posted on the social media service Instagram became the most liked online post of all time?
... that an image of <b id="mwAjE"><a href="./Instagram_egg" id="mwAjI" rel="mw:WikiLink" title="Instagram egg">an egg</a></b> posted on the social media service <a href="./Instagram" id="mwAjM" rel="mw:WikiLink" title="Instagram">Instagram</a> became the most liked online post of all time?