Of the 79% of Americans who use the Internet, an increasing number are engaging corporate brands.

Mashable Marketing Editor, Todd Wasserman (@ToddWasserman), reports that per a recent study by Forrester Research, 45% of people on social networks have interacted with a brand in the last three months.

No question younger people are more likely to interact with brands on social networks. 56% of those age 18 to 23 acknowledge “Liking,” following, or becoming a fan of a product or company. This is up from 41% in 2011.

But Americans age 68 and above are also interacting with brands on social networks, averaging three ‘Likes’ of brands on Facebook.

If you want to go where Americans are more likely to interact with your law firm brand, it’s Facebook over Twitter by a good margin.

No question law firms are just in the learning process of what works and what doesn’t for getting clients, potential clients, and the influencers of those two to engage the law firm’s brand on social networks.

But there’s little question the opportunity exists. Your audience is on social networks. In spades. They’re also engaging corporate brands by ‘liking,’ following, or becoming a fan.

It’s up to you to get out there on social networks with a well thought strategy that causes your audience to interact with your firm.