Having an existing partnership with Comcast was surely a factor in the decision to take on Plaxo, as the partnership included alerts for customers, among other integrated options. And in acquiring Plaxo, thanks to its vertical expansion with Plaxo Pulse, Comcast is hoping for an opportunity to really insert its brand into social media across the web.
There have been times when some of us here at Mashable had trouble thinking of an ideal acquisition situation for Plaxo, as it's somewhat on the fringe of networking given its progressive moves and sometimes non-user friendly integration with existing tools like Outlook. Nevertheless, we're all quite interested to see exactly how Comcast will be incorporating Plaxo into its own communications services.