G+ just launch several month ago, so it's too early to said how potential G +1, I'm sure in the future it will become facebook competitor
I think facebook is good, but I recomended to use twitter.. it can help you to more easy to get social marketing..
I recommend Facebook because facebook offers so many applications about promoting your websites. And the most importantly Facebook is more user friendly other than google+
Facebook as you can reach a much wider audience through Facebook. There is also various promotional methods that can be conducted through Facebook.
Google+ is no-where near a major player in the social market yet - some of their highest members have just over a million followers. I've seen this with stupidest fan pages on Facebook. The user base is just not there yet.
I still prefer Facebook as it has a lot of advantages over Google+. What I like most about Facebook is the interaction, it's not that boring as what others have.
If you must pick one, Facebook all the way. More users, more prominence, more marketing power. Google+ still has long ways to go before it could catch up to its biggest rival. It's too relatively new to make any impact yet, though who knows within the next few years.
Every have idea about social. So we want to make easy relation with all. Facebook is more easy way for this.