I have been using Google Reader for a very long time to aggregate all the blogs I read regularly into an easy to manage inbox.
When I went to my GReader app on my phone or tablet, all the "read" stories were nicely marked as read, and I could pick up where I left off.
Whenever I found an interesting blog that I wanted to keep up with, I added it to Google Reader.
When I saw the news of the closure of the service come by on my Twitter feed, I realized that I hadn't logged in in over a year to Google Reader!
All the same sort of interaction I had been getting from the blogs I follow had moved over to the Twitter.
If your primary goal for building your marketing list involves gaining more Google Reader Subscribers, Facebook fans, Twitter Followers, or Google+ Circlers.... YOU ARE MISSING THE POINT.
The lenses through which our customers, clients and audience view our message will change. The social networks will come and go. It is time to start building a database of your own.
It is this authors opinion that the only channel that has stood the test of time since the Altavista days is the good old fashioned opt-in email database.
When I inevitable forget to log into Google Reader before it closes, will I remember that I used to religiously read Lifehacker.com? What other companies/brands/colleagues will I lose touch with because they never took the time to ask for my subscription to their newsletter and opt-in to their database.
It is time to start thinking about building your own platform, and not relying on something someone else built and controls and is inevitably renting to you.
Your website should be the hub of all your messages/resources/news etc.... Use the social network dujour to spread the word/breadcrumbs back to your site, where you ask them to subscribe. That's Inbound Marketing.