What's appropriate on social media?

[b]

If you have a personal problem like a health issue, or the loss of a family member, or you have ended a relationship, or friendship, what is appropriate on social media avenues? For instance if you speak of such things, like missing a ex, or a friendship or a passed away family member, is it wrong? Or insensitive for anyone involved? I feel like people have had a tendency to express feelings of such matters online and others have gotten upset over expressed feelings.... Is it ok to express yourself on social media? Or should matters of the heart be left for other forms of expression?