I think any social network where the content is curated by some meaningful metric is going to do well in general. LinkedIn is curated by expectations of the corporate culture. If your content is positive (not necessarily helpful as is the case with LinkedIn majority of the time) you look more employable. And with LinkedIn becoming the de facto standard for orgs in their due-diligence on potential employees, the quality of your content can really help or hurt your future prospects. Other social networks like HN and SO operate in a similar way but slightly different curation metrics.