If people don't know you, the risk of misinterpreting what you say (e.g. a joke), is higher. Also, some people just don't 'get' another person's joke. I see that more as an individual differences thing between human beings rather than it meaning there is something wrong with you.

If it is online, you can always add emoticons. If it is people you have not known for a long time, maybe use caution about how the 'jokes' are phrased or how it will be perceived to even make a joke. Restraint may be more appropriate for newer relationships, to avoid hurt feelings on both sides. I see it as more about editing rather than censoring yourself.