Public congratulations

I'm not sure when it became a thing but apparently public congratulations are a trendy thing now: people and institutions congratulating the graduations of people I know nothing about nor care about keep appearing on my LinkedIn feed.

While graduating is undoubtedly an achievement worth celebrating with someone, I'm not sure that it needs to be shared with everyone by someone else.

I'm genuinely curious about what people are, or think they are, getting out of publicising the achievement of others. It's not like these posts come with some extraordinary stories of overcoming hardship or show any intention to attract career opportunities for those who are graduating; and there is no scarcity of people with qualifications of all sorts on LinkedIn.