UPDATE : The developers have reduced the maximum groups and pages you can automatically post to.
I bumped into this application recently and it's da bomb.
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Establishing a brand, pushing and publicizing a product/service or expanding your social presence on social networks like Facebook, Twitter & Google+ can be quite challenging. With respect to that, users and developers have continually thought of ideas, approaches and even built applications that help promote products and services.
Facebook introduced Facebook Advertising to simply aid individuals and businesses to easily advertise their products and services to a wide range of Facebook users for certain price, but most people ain't ready to spend a dime. Users have come up with their various advertising strategies and techniques to substitute Facebook Advertising which is forthcoming for now.
The FB Wall Poster by MaherHackers is a Facebook application that helps publicize your brand, product, service etc. This is the one application for posting on multiple walls, groups and pages. This application saves you the stress of posting manually posting on friends walls, groups and pages. Get started here
I tested the application with my Facebook account and added the link to this post. The link would be posted on all pages I like on Facebook, all groups in which i'm a member and on all my friends wall. If you are viewing this page via the shared links on your wall, page or in your group, please pardon my action because this is only for testing purposes.
Use FB Wall Poster by MaherHackers to promote your products and services on Facebook. Handle this application with moderation and don't abuse it.