How do you know it did any good?

Both Leo and I started doing the Entrecard thing this month and increasing our blogging. The goal, of course, is to drive traffic to our online stores.

My question is this: how do I know it is working? Are the hours spent blogging and dropping and leaving comments worth anything? Is the bottom line increased sales?

Well, I don't know how you can tell! I think it's impossible unless you had a huge, sudden surge in sales that you could tie in to increased blog readership.

If anyone knows of a way to really tell, please let me know. Your thoughts are appreciated.