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i think you should try Hootsuite
There is unknown service but a great one in the same time you it's called yoono
http://www.yoono.com/
I thought I'd describe our thought process for designing multi-posting via Postling.One of the things that frustrated me were tools like Ping.fm that would push out content to all sites in a way that was obvious you were doing so. Specifically, you can't write a long post, publish it to twitter and Wordpress, and expect it to work. Instead, many sites will automatically truncate your post and jam a link in there, leading you back to their page (not your blog). For that reason, we built Postling as a2* step process: you write a blog post and publish it to your Wordpress / Blogger / Tumblr / Typepad / Squarespace / Drupal / Facebook Notes, then you can update your states on Twitter / Facebook / LinkedIn with ahttp://bit.ly link that points to which ever blogging platform you had just published to. That way you can tailor the status update to be a well-converting teaser instead of an ugly truncation of your opening sentence.*In the case of blog posts that contain original photos, we'll also let you publish that photo to Flickr and Facebook Photo Albums. Handy!
use buffer. you can google buffer and create your account and link it with your profiles.
ONLYWIRE:
OnlyWire's automation tools allow you to publish content with ease. We check hourly for new content on your WordPress site or RSS/ATOM feeds and post to your favorite social communities on your behalf. Our Automation Suite includes: WordPress Plugin, RSS Feeds, and Developer API.
If you mean social media channels I suggest using Hootsuite. It has comprehensive reports and deep integration into each platform using the maximum possible permissions for the social media channels' API's.
