Starbucks’ Vice President of Brand, Content and Online, Chris Bruzzo, is on stage at the Mashable Media Summit today and he just revealed that last year’s Free Pastry Day was a whopping success, driving more than one million people to stores.

As we noticed, activity on social media sites like Twitter and Facebook became electric on the day of the event as the free pastry news spread in digital form. Bruzzo’s credits fans with the idea to use social media to drive new business, and his remarks confirm that the swell of social media activity drove customers to visit Starbucks stores in droves.

Bruzzo also speaks to the success of the company’s Tax Day green initiative to get customers to bring in their own tumblers in exchange for free coffee, which — like Free Pastry Day — was primarily promoted online via their Facebook Page. Also, the company’s MyStarbucks Idea has generated more than 80,000 ideas and Bruzzo credits Product Manager Brad Nelson for helping them tap into the power of Twitter.

Right now there’s no big brand better embracing social media than Starbucks. The coffee retailer has managed to dominate on Facebook, made news as the first company to offer a nationwide Foursquare deal, and was selected to try out Twitter’s Promoted Tweets ad platform before other advertisers will have the chance.

Though banks are uncomfortable with the concept, many are essentially in the retail business. In my area of the Southeastern US, Bank of America and Chase have a retail delivery network akin to quick-serve restaurants, pharmacies, and gas stations. There seems to be one on every corner.

Considering the current expansion of branch networks (mostly through merger & acquisition), it makes sense that a more engaging brand personality would be good for business.

That said, it was a refreshing surprise to read an article in US Banker’s May issue describing how North Shore Bank was experimenting with Foursquare and other social media channels to create brand awareness in the communities it serves.

The $1.8 Billion bank based in Brookfield, Wisconsin has a tech-savvy e-Business Coordinator, Tim Gluth who decided to contact the “mayors” of the bank’s 44 branches and offer them a $5 Subway gift card for their patronage. “Patronage” could be a stretch as the bank did not ask if the mayors were customers of the bank, they simply acknowledged their mentions of North Shore online to say “thank you”.

Mr. Gluth found the “Mayors” on Twitter and Facebook and made contact initially through those channels. The promotion was greeted with surprise and, from this perspective, was successful in establishing customer engagement. The bank has since carried on to sponsor local Tweet-Ups in support of the minor league baseball Timber Rattlers.