Thank you all for the feedback!
At first i made an account at Socioboard because i sympathize with open source projects.
I didn't test all its functions because it doesn't support Linkedin, Pinterest and Instagram, also it supports Google + but only for monitoring the posts and community feedback, you cant actually make posts from socioboard.
Also i have to mention this about open source feature, you can download the software and run it from your own server, if you have the knowledge to do this then its ok, but if you use socioboard from their servers then you don't have any access to the code and you don't know whats really happening. The advantages of using open source in this case are not very clear.
Open source is gaining popularity in the last years and may be used only as a marketing strategy. Something similar happens with environmental issues and some firms using this topic only as a marketing approach (search "greenwashing" in wikipedia). I don't know if this is the case but that's what i felt.
I didn't make an account at Hootsuite because they only allowed 3 channels in the free account, im willing to pay the price if it means an increase in sales, but i want to try others first.
I made a free account at Everypost and i have linked my Facebook, Twitter, Linkedin and Pinterest profile and made a post with success. I failed linking my google account for some reason, but im looking forward in solving this issue. If i can link all my social networks i can say that Everypost satisfies my needs.
Another feature of Everypost is the link shortener, very useful for Twitter. Everypost doesn't support Instagram, apparently the only one that supports Instagram is Hootsuit, i don't know how this functions considering that for posting on instagram you have to use your cellphone.
Everypost focuses on posting and not interacting with the community. I agree with Eduardas that is important to interact with the community to maximize your reach. Tools like Hootsuite are designed for community managers who have multiple clients and need to manage various accounts, in that case is very useful having the option of following feeds and interaction tools that allow you to manage all account in one site without logout/login each time you want to switch. However i have to manage only one account, where im already logged in my computer so whenever i want to interact i can just open the social network in different tabs and dedicate some time interacting directly from there, so i don't consider that to be a problem unless you have to manage community networks of other projects you have.
In an info graph made by CGTrader they discouraged copy/pasting because google indexation would tend to hide these posts. Posting using these tools would result in the same problem?