Is there a service like Unbounce with integration with Facebook Connect for signups and the Share/Like buttons?

Hey there, 

Taryn from Unbounce support team here 👋

You can add a social widget to your landing page by following the instructions here: https://documentation.unbounce.com/hc/en-us/articles/203660994-Adding-Social-Widgets 

If I’m misinterpreting your question, please let me know! If so, it would be great if you can link to an example of what you’re looking to achieve :) 

Cheers, 

Taryn