Let your customers decide the best product by "liking" it. http://addons.prestashop.com/en/front-office-features-prestashop-modules/18421-product-likes.html

1. www.prestatoolkit.com
Version: 1.0
Product Likes

2. Installation
This module requires PrestaShop 1.5 or newer version.
To upload Module:
1. Go to Back office >> Modules >> Click upload module and select ZIP module file to upload.
2. After uploading module you can find it under “Front office Features Tab”.
3. Click install button and you are done.
4. Click Configuration link to edit Settings.
5. Likes to all products can be viewed under Catalog >> Product Likes.
6. New Tab is also added to every product edit so Admin can edit like counts.

3. Adding Like Counter to PS 1.5
Like counter is pre added to product pages but in PS ver 1.5 product listing counter has to be
Added manually.
Go to themes/yourtheme/product-list.tpl and add this code just after <li> element starting.
{hook h='displayCatalogListing' product=$product}

4. Additional Help
For further assistance, please send message through PrestaShop
Addons.
We also offer Custom Module creation and web shop modifications.
For inquiry send us email on prestatoolkit@prestatoolkit.com