Always log out

Whats a bigger pain, logging in anew for each session or explaining how that offensive tweet got on the corporate account? Id let you consider it, but if you have to think about it, I dont want you in charge. Do not send confidential information through a social networking site even if someone who has legitimate access to that information asks you to. See point number 2. Beware of what links you click and what software you download and install. Do not trust links/software sent by your friends implicitly as they themselves might not be aware it includes malware or their account might have been compromised.