That said, I'm not even on Google+ so I think I can be unbiased on the subject. I didn't join because I love twitter and stocktwits where I can trade stocks and socialize @ the same time.
Ok, with that out of the way, I read an article where Brian Deagon said "Google+ will do no harm to facebook"
I disagree with that and here's why. Google has a cloud and facebook dosen't. A good example of why this is a huge edge is the Google+ Hangout feature. If you don't know what that is take a look here:
In the beginning of 2011 I tweeted that Google or facebook should buy tinychat, a service that basically does what hangout does, group video chat. Instead of buying tinychat Google made their own. Facebook could probably make their own also but the differentiation is the fact that the group can watch youtube together.
A couple of months ago a movie called "Margin Call" came out and it was offered on youtube. It's a great movie about trading and rumored to be based on what Goldman Sachs did when the market crashed in '08. (if you trade and you haven't seen this movie your soooo slacking on your macking) Anyway, the trading community was all a buzz about the movie. It costed $6.99 to watch on youtube and it's still on there and now it only costs 3.99.
Imagine if Google can secure classic iconic movies or new iconic movies like "Margin Call" (yes, it's iconic) and premier it only on Google+ hangout. Say it's regularly $9.99 but if you can get enough of your friends to join Google+ and watch it with you it's $6.99 each. Or say a pop star or rapper makes an Independent film starring themselves and they ran it on Google+ hangout and watched it with their fans on Google+ hangout! They could charge $19.99 for something like that. I imagine concerts, webisodes, sporting events, even the "Google+ Church of Modern Day Saints" being streamed every Sunday.. Anything exclusive that's streamed on youtube will be watched in groups only accessible through Google+. And all Google is providing is the service, or better yet since they need content in the form of youtube movies they could go half on the costs with the pop star/rapper to make movies, a scaled up youtube partners program. Even just with regular youtube videos this is a game changer. youtube videos get a LOT of views.
None of this is a facebook killer though. But I'll tell you what is. Once Google can connect this to their tablets and phones (if they haven't already) it could be a wrap for facebook. @ any rate, even before it get's on tablets and phones, when this catches on, and it will catch on (if it hasn't already as Google+ is growing pretty fast) facebook will be in trouble. I think twitter will be fine as it reaches a wide enough swath of people that it'll still make sense to keep that account. How else would you meet new diverse interesting people to add to your Google+ circles? A lot of people use facebook a lot more intimately with just close family and friends so Google+ is direct competition and simultaneous group interaction is powerful. And......
It's the cloud factor.
You got great hardware and great software? Great, but wait, what can it connect me to? Apple showed the way with itunes and ipods. Google shouldn't come out with completely proprietary hardware but you should have extra capabilities on the Android OS when you go into Google's cloud. Or get exclusive blasts to pop-up streaming events on Androids. Something special. It's all coming down to the cloud. Your technology must compliment your cloud and vise versa. But first you have to have one and from what I can tell facebook doesn't have one.... So, right now to me the winner is Google+.