Yes it's very much important... visit this blog to get the list of article, forums, directories and bookmarking sites. http://seolearninginstitute.blogspot.com/
Yes, but not if you simply post the links up without using the G+ account; I'm sure google knows that people will create spam intended accounts, so make sure you actually use the account, and share your links regularly - like you would with facebook pages and twitter accounts.
I have good results with, click on real people - not bots and macros, my service offer real users, try its promo cheap G ppl says that this is an effect on search results, especially for people logged in G
I belive it is the most beneficial becuase google is using it as a social signal in their ranking algorthim. Morever Google is becoming the greatest leader in social network
Ya it is beneficial as these links are directly sync in Google search and other search engines. Though u may not see its effect immediately but regular, consistent and good contains will definitely show u results in future.......
As SMO is an important part in the process of link popularity and Google+ : a new site providing the same social networking space.So one can use it as a good source of link popularity..
If a visitor +1's your website then that website will be more likely to appear in the search results when that user is searching and they are logged into google. Also, the links may not pass link juice, but they do give you anchor text refrences so they do have value.
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At first you have to remind that this is product of google and you want your rank in google so what are you thinking now it is very good to post your link in google plus.