This is an article I came across a few years ago regarding the decision of adding social login: http://blog.loginradius.com/2014/02/7-considerations-using-social-login-on-website-app/ It does a good job of highlighting the key consideration points.
We've done something similar, but by delivering pizzas. You can get them talking about you before you come in if you have it delivered, wrapped in gift paper, with a mysterious, clever, anonymous note complementing their pipes. Then drop in and ask if they liked the poster. It will probably go...
Congratulations on jumping head first into the digital age! And good for you for having the passion and enthusiasm to learn about new ways to market your business ideas. There are plenty of free resources out there to help you learn from top internet marketing minds. Check out this list of the t...
Ask them to brief explain their methodology and most important the KPI's that they will track thru your project. That way you can compare different agencies KPI's and see the ones that make sense with your business goals. A few ones to exemplify: General: Traffic, Sources, Conversion Rate, Bounc...