I just newly joined pinterest.com and so far it is the same as any other social network, I have to invest my time with it (which is worthy). Than having a coffee and talking about somebody else' business :)
The advantage of pinterest and any other social media is, it showcases your online presence or your business in a low cost.
Pinterest combines the 2 elements in social media.
1. Visual content; and
2. Sharing who you are.
So, get your pinterest now :)