Today, if not over-promoted, sharing your social activity or the content you generate in various ways is a good method to gain exposure.

WiseStamp is an add-on, with versions for Firefox, Chrome, Safari, Flock and Thunderbird, for auto-inserting content from various resources to e-mail signatures.

WiseStamp

Besides Thunderbird, it is compatible with the popular e-mail services like Gmail, Hotmail, Yahoo Mail and AOL.

The content inserted can be grabbed from a RSS feed, Facebook, Twitter, Digg, Delicious or almost any other social network account.

The add-on is multilingual and already has support for 10+ languages.