What do Barack Obama, Britney Spears, and Bill O’Reillyall have in common? All were among the 33 celebrities who had their Twitter accounts hacked yesterday.

This followed hot on the heels of the weekend’s Twitter phishing attempts, and a number of reports of people being DM’d affiliate links and marketing tools.

What can you do?

• Treat your Twitter account like your email, don’t give out your password to third party sites.
• Change your password regularly.
• If you receive a spammy DM from a friend, check if they really sent it. It could be that their account is compromised without their knowledge.
• Beware of phishing. Check the URL of the site. Be sensible!