At the same time, I'm bullish. Seems contradictory, but it's not. Despite its relative weaknesses, Facebook has life left. When mobile revenue at the company explodes -- and it will -- look out. Plus, the forthcoming Facebook Gifts initiative should help drive mobile as well as overall revenue. Mark Zuckerberg and Sheryl Sandberg have their stuff together. Don't underestimate them. In the near term, there's plenty to get excited about. That said, they do not have power over the "content" their users share. Twitter doesn't either, but, for myriad reasons, the Twitter platform facilitates useful and clever submissions of relative quality. There's a sense that the inmates run the asylum on your Facebook feed. Of course, you could block annoying people, but do you really want to be bothered by that? There's a magnetic force Facebook exerts that keeps me coming back. But, for how long? On Twitter, you do not have what amounts to this unnatural obligation to follow your "friends." Instead, you actively seek out the best and the brightest. That might be a media source or some random human who routinely makes magic or, at the very least, doesn't make a fool of his or herself, in 140 characters or less. On Twitter, you rarely have sympathy follows like you do on Facebook. I estimate I friended about 10% to 20% of the people I am "friends" with on Facebook because I didn't want to make anybody feel bad. You can get by on Twitter by simply not following the kid who picked his nose and ate it in grade school; that doesn't fly on Facebook. When I disregard a friend request on Facebook, the telephone tree in Niagara Falls, NY, activates. Immediately, I get a call from my mother reprimanding me for not connecting with some kid I apparently sat next to in fourth grade. On Twitter, you can "unfollow" most people or entities and nobody feels bad. It's nothing personal. Over the last week or two, I have unfollowed a couple hundred people. I have no choice if I want to keep my feed tidy, useful and productive as it relates to my work and primary interests.