Each site serves a different purpose, they each have their place. There's no sense using just one, I'd recommend using all 3 of them.
All 3 are best. No 1 facebook. No 2. Google Plus No 3. Twitter.. I use all these 3 to generate traffic for my blogs and websites
Certainly Facebook are still the main runners, although Twitter is gaining new users fast!! Google + will become huge too I feel. After all look at the amount of money Google has and could pump into the project to make it compete. My guess for business - be a member in all 3!!
Used as a whole is best, you have to figure they have their own qualities and uses. If you are talking about marketing??? use them all.For Social stuff use what ever you like.
i prefer facebook, but they all got their advantages, so make a full or reasonable use of each will bring you a lot of benefits. Now we talked a lot about social network marketing, it is very easy to bulid word of mouth on them and expand influence of your brands.
All of them are good social networking platforms and of course powerful. And i do give the preference to them as follows: 1. Facebook 2. Google+ 3. Twitter.
google is the wide search engine but the face book is used for making friends and connect the more people.
All three have different uses and so it depends on what you want to achieve with the platform, social networking is Facebook, professional networking is Twitter and Google+ is a combination of these but still in infancy, though it is good for websites needing a search engine boost up..