Is it ok to put your Facebook and Twitter URLs on business cards?

I agree with the previous posts, it's all about the business type.. Another solution (more appropriate at my humble opinion) is to make a facebook page and a twitter accound of your business and begin to try social marketing!

I think it really depends on the business type.

I don't think its really professional to have them there. Maybe have some links from your website, or put it in your signature on your email after your name. (If you are really interested in my opinion leave a comment with your business type).

I would say, only if your Twitter and Facebook are connected or used for your work :)

Like the last post I think it depends on the business type. I think it also depends on what content you publish and have on your facebook and twitter accounts. Say to yourself "Do I only post things that I would actually show or tell my customers in person?"

Put a link on the business cards to your websites, Then, put a link to your Twitter OR/AND Facebook account on your site.

What do you think? Also, make sure that the contents of Facebook AND/OR Twitter are suitable for business too.

Lastly, is link the to Facebook to your personal profile or your business's page? (NO PERSONAL)

With the way that the world is going, you have to take a few things into consideration.

1) Is my Facebook/Twitter address I am using on the cards strictly professional, with no social inter-action tainting the content? 2) Is my social FB/Twit account separated, with not cross-over followers or re-tweets? 3) Can some connect the social version to the Professional version of each or of the other easily? 4) Once connection is verified that someone can not easily connect the two social networks to both side of the 'created' versions of yourself (Professional vs. Social), continue on with the next considerations. 5) You have isolated the two version of yourself in the social media, now it is time to 'seed' the professional version of your social medias such that they will create a profession outlook that will enhance your business they were created for. 6) Connect to ONLY professional sites using these professional versions of yourself. Allow NO cross-over to occur.
7) Make sure anyone that might be from your social versions of your social media does not 'tag' or comment or place any connectivity to your social version on your professional version. You have to be diligent to this part to keep your two version separate. 8) Advance the professional side of your social media that will entice more business or your standing in the professional field you are trying to represent.

Only after you have taking all these into considerations and maintained a separation of your social life from your professional life within these social medias, would I suggestion placement of the social media's URLs on advertisements such as calling cards. The amount of diligence you apply to maintaining the separations is the key to only part of the success of the placement; advancement of the sites to enhance your professional side is the other key.