Email signatures are a great way to easily share your social media information with people you know and new contacts. I have a few different signatures I use depending on the company and the situation around the email. This is a great way for people to quickly learn more about you, your company and your products or services.
There is a great service called WiseStamp that is available for those that use web based mail (Gmail, Yahoo, Windows Live and AOL). You can embed recent updates from your social media sites, recent blog posts or podcasts. This is a great free plugin! It works with firefox or flock browsers, internet explorer is not supported at this time. Want to see some sample social media signatures that have been created by others?
For Outlook users you can use images and links with HTML to share your networks. I have not found an easy way to integrate live feeds into a signature with Outlook. But the images and a compelling statement will get people clicking on your links!
What do you use for your email signatures?

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