I too have a linkedin account that's been languishing. I recently went through and added people I've been working with closely over the last year from my email

I too have a linkedin account that's been languishing. I recently went through and added people I've been working with closely over the last year from my email and phone contact lists. Amazing how fast I grew my connections in just a couple days. I think that this is probably how it's supposed to work. Long slow periods, punctuated by quick rapid action while people do spring cleaning.