Law firms are finally catching on to the social media craze after years of reluctance that saw companies in other industries strengthen their brands online. A My Case study found that 57 percent of law firms now maintain a LinkedIn presence, 35 percent are on Facebook and 21 percent are using Twitter.

But what about Instagram? Turns out the app wasn't even included in the survey, begging the question: why are law firms off the map when it comes to social media's fastest-growing platform?

Perhaps there's a disconnect between the management at law firms and Instagram's younger demographic, with more than 75 percent of users under age 35. Or maybe it's the perception that Instagram is reserved for sunsets, skylines and swimsuits that is keeping law firms away.