1 out of every 3 professionals on the planet is on LinkedIn.
Facebook is massive in scale and scope. Twitter is a public communication forum, but if I'm following you, you're not necessarily following me. LinkedIn is, simply, a professional network.
Putting a photo into your LinkedIn stream increases engagement up to 90%.
I avoid Facebook, LinkedIn and Twitter, and if I need to communicate with someone, I email direct.
Linkedin is for people you know. Facebook is for people you used to know. Twitter is for people you want to know.
It's just madness. First email. Then instant message. Then MySpace. Then Facebook. Then LinkedIn. Then Twitter. It's not enough anymore to 'Just do it.' Now we have to tell everyone we are doing it, when we are doing it, where we are doing it and why we are doing it.
I am a huge consumer of social networks, and I utilize Twitter, Facebook, and LinkedIn. I'm interested and am learning more about Tumblr and other visually dominant sites.
LinkedIn is very good for browsing relationships and hooking into your contacts' networks. It re-connected me with high-level execs I hadn't talked to for some time, who then helped me close various deals.
