facebook share button with custom title, description, and image [duplicate]

Answer 1

1. Use Open-Graph Meta Tags to let Facebook get the data you want when scraping the page.
2. Facebook will not respect the parameters you pass to sharer.php instead it'll try to get the info from the page.
3. The Like plugin is the way to go and if you really don't have a good reason to use sharer...don't use it!
4. Check your URL against the Facebook Debbuger to better test your links.