Posting your Public Keys on Social Media
Why should you not do this? Why is this a problem?
You should not do this, especially if you have a large amount of crypto-wealth, as it paints a target on your back. If people know that you have cryptocurrency, you may become the victim of a targeted hacking campaign.
Interacting with your Private Keys on Public Networks
Why is this a problem?
The increasing popularity of cryptocurrencies correlates with an increase in bad actor attention. It is possible that anyone on the same public network (coffee shop, library, etc) as you could be packet sniffing. Your private keys could be sniffed if you're interacting with them online.
You can mitigate this by Running MyCrypto Offline.
If you don't understand any of the terms in this article, please try referencing our Ethereum Glossary.