Social media was originated from the very point being able to express your views freely and able to express yourself without any restriction.
However, there may be possibilities that different type of expression, for example: Facebook gives you the freedom of expressing anything while twitter gives you 144 characters to express yourself which limits you.
On the other hand, LinkedIn takes a bit formal approach. However, people nowadays have misunderstood the meaning of right to freedom of speech but as we know you may not be able to stop each & everyone of the social media.
Anyone can speak whatever they want, they can express in any way they want on social media. Freedom speech may make some people express something offensive but its really difficult to stop until we start educating them to respect others privacy.
WAIT UNTIL IT HITS YOU!