The Saatchi & Saatchi Italy-created video starts with on-screen text that summarises a letter sent to the organisation by an expectant mother who has just found out her unborn child has Downs Syndrome.
During the video, people with the syndrome reassure the mother, before their own mothers appear alongside them.
The most-shared ad for a second week in a row was Wren Clothing's "first kiss". The ad, which was shared 275,594 times this week, was created and directed by Tatia Pilieva and features pairs of strangers kissing for the first time.
Elsewhere in the chart, a teaser for an upcoming campaign for Adidas-brand Neo starring Justin Bieber appeared in sixth place.
The ad, shared 40,065 times this week, is silent and stars Bieber dancing around a microphone stand.
275,594 shares this week | 1,364,999 shares all-time
225,500 shares this week | 186,398 shares all-time
170,695 shares this week | 193,558 shares all-time
63,663 shares this week | 80,618 shares all-time
55,400 shares this week | 845,895 shares all-time
40,065 shares this week | 37,133 shares all-time
26,270 shares this week | 26,270 shares all-time
24,486 shares this week | 81,944 shares all-time
19,181 shares this week | 29,339 shares all-time
18,781 shares this week | 385,374 shares all-time
This article was first published on campaignlive.co.uk